| isoenzymes detect variation in populations of triatoma brasiliensis (hemiptera: reduviidae: triatominae). | triatoma brasiliensis is one of the most important vectors of chagas disease in the semiarid zone of the northeast of brazil. intraspecific morphological and behavioural variation has been reported for different populations. results for four distinct populations using eight isoenzymes are reported here. the literature describes three subspecies: t. brasiliensis brasiliensis neiva, 1911; t. brasiliensis melanica neiva & lent, 1941 and t. brasiliensis macromelasoma galvão, 1956. these subspecies d ... | 1997 | 9361737 |
| influence of light conditions on adult mortality and egg-laying of triatoma brasiliensis neiva, 1911 (hemiptera: reduviidae: triatominae). | we compared, for triatoma brasiliensis, the egg-laying process and the mortality of adults under conditions of almost permanent darkness and with normal laboratory luminosity. mortality did not differ between groups. the egg-laying per vial and per female was significantly greater in the group of normal luminosity. we consider that it is not recommendable to keep the adults of this species under complete darkness. other biological aspects should be analysed in relation to luminosity. | 1992 | 1340536 |
| anti-complement activity in the saliva of phlebotomine sand flies and other haematophagous insects. | the saliva of haematophagous insects has a series of pharmacological activities which may favour blood feeding. in the present study, an inhibitory effect on the complement system was observed in salivary extracts obtained from the phlebotomine sand flies lutzomyia longipalpis and lu. migonei. saliva from lu. longipalpis was capable of inhibiting both the classical and alternative pathways, while that from lu. migonei acted only on the former. other haematophagous insect species were screened fo ... | 2003 | 12885192 |
| [the epidemiology of chagas' disease in a rural area of the city of teresina, piauí, brazil]. | in the rural areas of teresina, 129 triatomines were captured distributed in (a) artificial ecotopes; a house with one triatoma brasiliensis, one panstrongylus geniculatus, rhodnius pictipes, and one rhodnius prolixus and in a uninhabited chicken house (7 rhodnius nasutus). (b) natural ecotopes; pahus orbignya martiana (41 rhodnius neglectus, 33 rhodnius prolixus and 41 rhodnius nasutus) and copernicia cerifera (3 rhodnius neglectus). the 22.6% of captured triatomines were infected by flagellate ... | 1992 | 1308066 |
| blood-feeding performance of nymphs and adults of triatoma brasiliensis on human hosts. | the blood-feeding behaviour of nymphs and adults of triatoma brasiliensis fed on the forearm of human volunteers was studied by electronic monitoring of the cibarial pump. parameters of total contact time (tt), initial weight (iw), weight gain (wg), ingestion rate (ir), pump frequency (f), quantity of liquid ingested per cibarial pump stroke (qlc) and non-ingestive time (nit) (cumulative probing time and pumping interruptions during blood feeding) were measured. protein profile (sds-page) and qu ... | 2003 | 12875930 |
| ecologic niche modeling and differentiation of populations of triatoma brasiliensis neiva, 1911, the most important chagas' disease vector in northeastern brazil (hemiptera, reduviidae, triatominae). | ecologic niche modeling has allowed numerous advances in understanding the geographic ecology of species, including distributional predictions, distributional change and invasion, and assessment of ecologic differences. we used this tool to characterize ecologic differentiation of triatoma brasiliensis populations, the most important chagas' disease vector in northeastern brazil. the species' ecologic niche was modeled based on data from the fundação nacional de saúde of brazil (1997-1999) with ... | 2002 | 12479554 |
| molecular cloning and sequencing of salivary gland-specific cdnas of the blood-sucking bug triatoma brasiliensis (hemiptera: reduviidae). | haematophagous insects produce pharmacological substances in their saliva to counteract vertebrate host haemostasis events such as coagulation, vasoconstriction and platelet aggregation. to investigate the bioactive salivary molecules of the triatomine bug triatoma brasiliensis, we produced subtraction-enriched cdnas of salivary-gland specific genes using suppression subtractive hybridization. six full-length differentially expressed cdnas (tb113, tb125, tb152, tb169, tb180 and tb198) were selec ... | 2002 | 12421416 |
| fungal flora of the digestive tract of 5 species of triatomines vectors of trypanosoma cruzi, chagas 1909. | a study of the mycobiota in the digestive tract of 5 important species of triatomines, triatoma brasiliensis, t infestans, t. sordida, t. pseudomaculata and t. vitticeps, was made. the digestive tracts of 164 adults and 535 nymphs of those triatomines were studied and 393 fungal strains were isolated. the genera with the greatest number of species were penicillium (19 species), aspergillus (17 species) and acremonium (5 species) and the most frequent species, in decreasing order, were penicilliu ... | 2001 | 11502063 |
| genetic variability of triatoma brasiliensis (hemiptera: reduviidae) populations. | isoenzymes, random amplified polymorphic dna (rapd), and morphometry were used to compare genetic variability within and between three populations of triatoma brasiliensis neiva, 1911 from northeast brazil. the isoenzyme profiles were identical for the three populations, whereas the complex rapd patterns allowed clear discrimination between the three. morphometric analysis, using characters of the head capsule, also showed discrimination between the three populations but only in comparisons of m ... | 2000 | 11126543 |
| [focal and total residual insecticide spraying to control triatoma brasiliensis and triatoma pseudomaculata in northeast brazil]. | to efficiently control the triatomines triatoma brasiliensis and triatoma pseudomaculata, a field trial was performed to compare conventional versus focal spraying of deltamethrin 5% sc at 25 mg a. i./m2 and the slow-release organophosphate malathion 8.3% sr at 2g a. i./m2. the assay took place in the county of boa viagem, ceará state, with 1541 households, randomly separated into 4 groups. two of them received focal spraying: pt, treated with deltamethrin indoors and in the peridomicile, and pl ... | 2000 | 11119328 |
| [use of random amplified polymorphic dna (rapd) in the populational study of triatoma brasiliensis neiva, 1911]. | we evaluated the genetic variability of triatoma brasiliensis, the main vector of chagas disease in northeast brazil, using specimens from three populations. regions of genomic dna were amplified by rapd (random amplified polimorphic dna), using two primers. the products were visualized after polyacrylamide gel electrophoresis followed by silver staining. a dendrogram constructed through the dice similarity coefficient allowed for separation of the tested specimens into three distinct groups. th ... | 2000 | 11119326 |
| [distribution and characterization of different populations of triatoma brasiliensis neiva, 1911 (hemiptera, reduviidae, tritominae)]. | triatoma brasiliensis neiva, 1911 is now considered the most important chagas disease vector in the semiarid zones of northeastern brazil. four distinct populations of t. brasiliensis have been identified by multidisciplinary studies: brasiliensis (caicó, rn), melânica (espinosa, mg), macromelasoma (petrolina, pe), and juazeiro (juazeiro, ba). by scanning electron microscopy of egg exochorion, each population displayed a distinct ornamentation pattern. the brasiliensis, macromelasoma, and juazei ... | 2000 | 11119325 |
| chromosome homogeneity in populations of triatoma brasiliensis neiva 1911 (hemiptera - reduviidae - triatominae). | triatoma brasiliensis is the most important vector of chagas disease in the semiarid zone of the northeast of brazil. several authors have reported the occurrence of four chromatic patterns with morphological, ecological, and genetic differences. in order to determine the existence of cytogenetic differentiation between these chromatic forms, we analyzed their karyotypes and the chromosome behavior during the male meiotic process. triatoma brasiliensis shows distinct and specific chromosome char ... | 2000 | 11119323 |
| genetic heterogeneity in trypanosoma cruzi strains from naturally infected triatomine vectors in northeastern brazil: epidemiological implications. | eighteen trypanosoma cruzi strains isolated from naturally infected triatomines were studied genetically. the majority of the strains were from triatoma brasiliensis, the principal vector of chagas disease in the northeast of brazil. multilocus enzyme electrophoresis (mlee) and randomly amplified polymorphic dna (rapd) analyses were used to investigate the genotypic diversity and the spread of the t. cruzi genotypes in different environments. mlee clearly distinguished two distinct isoenzyme pro ... | 2005 | 16341768 |
| [operational aspects of triatoma brasiliensis control]. | vector control strategies against indigenous species is not easy, due to their capacity to reinvade treated premises from sylvatic ecotopes. between august 1996 and december 1997 we conducted a study on reinfestation of houses after spraying in a county in the state of ceará. of 277 houses examined, 113 (40.8%) were infested (21.7% intradomiciliary and 35.4% peridomiciliary). of the 433 triatominae collected, 207 were triatoma brasiliensis (49% of which intradomiciliary, with a mean of 1.8 insec ... | 2000 | 11119320 |
| [general situation and perspectives of chagas disease in northeastern region, brazil]. | primary and secondary data show the importance and distribution of human chagas disease (hcd) in northeast brazil. among the 27 detected vector species, triatoma infestans, panstrongylus megistus, triatoma brasiliensis and triatoma pseudomaculata are epidemiologically important. major medical impact is attributed to t. infestans and p. megistus, the most domiciliated and vulnerable species, while the other two are native and more difficult to control. regional differences in transmission and med ... | 2000 | 11119317 |
| performance of yeast-baited traps with triatoma sordida, triatoma brasiliensis, triatoma pseudomaculata, and panstrongylus megistus in laboratory assays. | the effectiveness of a trap for triatomines baited with yeast cultures has been previously demonstrated for triatoma infestans in laboratory assays. we report here results from laboratory assays testing yeast traps for triatoma sordida, triatoma brasiliensis, triatoma pseudomaculata, and panstrongylus megistus. all assays were conducted in an open experimental arena 100 cm x 100 cm, with two traps placed at opposite sides of the arena. one of the traps contained a yeast culture, and the other tr ... | 2000 | 10949899 |
| comparison of feeding behaviour of triatoma infestans, triatoma brasiliensis and triatoma pseudomaculata in different hosts by electronic monitoring of the cibarial pump. | feeding behaviour of triatoma infestans, t. brasiliensis and t. pseudomaculata on pigeons and mice was compared by electronic monitoring of the cibarial pump. the methodology developed permits the study detailed of triatomine feeding behaviour using an artificial feeder as well as on live hosts. t. infestans was the species that fed most rapidly on the two hosts tested (28.03+/-1.6 mg/min for pigeon and 21.33+/-1.7 mg/min for mouse), followed by t. brasiliensis (17.09+/-1.4 mg/min and 13.1+/-1.5 ... | 2000 | 10817838 |
| population dynamics and feeding behavior of triatoma brasiliensis and triatoma pseudomaculata, main vectors of chagas disease in northeastern brazil. | biological parameters of triatoma brasiliensis and t. pseudomaculata that could influence the epidemiological importance of these insects as vectors of trypanosoma cruzi were compared. the parameters studied were incubation period, interval between hatching or moulting and first feeding, number of blood meals, development time, mortality, net reproductive rate, instantaneous daily reproductive rate, time-lapse before starting feeding, duration of feeding, blood ingestion capacity, occurrence of ... | 2000 | 10733731 |
| survey for trypanosoma cruzi infection in a municipality in northeast brazil. | an epidemiological survey of trypanosoma cruzi infection was carried out in bodocó, located in the western part of the state of pernambuco, brazil. two hundred and forty-one individuals were parasitologically and immunologically screened. although hemoculture did not reveal the presence of parasites in the blood, the sera of 5 individuals were scored as positive by the indirect fluorescence antibody test and the enzyme-linked immunosorbent assay. seropositivity in individuals above and below the ... | 1999 | 10733161 |
| the synanthropic process of chagas disease vectors in brazil, with special attention to triatoma brasiliensis neiva, 1911 (hemiptera, reduviidae, triatominae) population, genetical, ecological, and epidemiological aspects. | | 1999 | 10677724 |
| beauveria bassiana (hyphomycetes) as a possible agent for biological control of chagas disease vectors. | beauveria bassiana (balsamo) vuillemin (isolate cg306) was tested on 3rd instars of 9 triatoma spp., 4 rhodnius spp., 2 panstrongylus spp. and dipetalogaster maxima (uhler) at 25 degrees c and 50% rh. quantitative sporulation of the fungus on cadavers was studied at 25 degrees c and 97% rh. mortality, estimates of survival time, and conidial production on cadavers differed significantly among the genera and species tested. panstrongylus herreri wygodzinsky, dipetalogaster maxima, triatoma pictur ... | 1998 | 9835689 |
| ecotopes, natural infection and trophic resources of triatoma brasiliensis (hemiptera, reduviidae, triatominae). | triatoma brasiliensis is considered as one of the most important chagas disease vectors in the northeastern brazil. this species presents chromatic variations which led to descriptions of subspecies, synonymized by lent and wygodzinsky (1979). in order to broaden bionomic knowledge of these distinct colour patterns of t. brasiliensis, captures were performed at different sites, where the chromatic patterns were described: caicó, rio grande do norte (t. brasiliensis brasiliensis neiva, 1911), it ... | 1998 | 9698835 |
| reproductive isolation between triatoma brasiliensis neiva, 1911 and triatoma petrochii pinto & barreto, 1925 (hemiptera reduviidae). | | 1971 | 4945961 |
| [epidemiology of chagas disease in the municipalities of castelo do piaui and pedro ii, state of piaui, brazil]. | triatoma brasiliensis, triatoma pseudomaculata and rhodnius nasutus were captured in artificial and natural echotopes in ten localities situated in rural areas of castelo do piauí and pedro ii, state of piauí, brazil. nymphal instars predominated and birds were the main blood meal source for triatomines. t. brasiliensis was the only triatomine captured inside the houses searched, harbouring flagellates morphologically and biologically indistinguishable from trypanosoma (schizotrypanum) cruzi. sp ... | 1989 | 2517851 |
| possible oral transmission of acute chagas' disease in brazil. | in october 1986, 7 to 22 days after a meeting at a farm in paraíba state, 26 individuals presented with a febrile illness associated with bilateral eyelid and lower limb edema, mild hepatosplenomegaly, lymphadenopathy and, occasionally a skin rash. a 11-year-old boy exhibited atrial premature complexes and a 74-year-old patient developed acute heart failure. in two patients hospitalized in são paulo city, acute chagas' disease was diagnosed by the demonstration of circulating trypanosoma cruzi. ... | 1991 | 1844961 |
| lethality of triatomines (hemiptera: reduviidae), vectors of chagas' disease, feeding on blood baits containing synthetic insecticides, under laboratory conditions. | a laboratory study was conducted to test the toxicity of synthetic insecticides added to defibrinated sheep blood kept at room temperature and offered as food to the following triatomine species: triatoma infestans, panstrongylus megistus, triatoma vitticeps, triatoma pseudomaculata, triatoma brasiliensis and rhodnius prolixus. the insecticides used, at a concentration of 1 g/l, were: hch, ddt, malathion and trichlorfon, and the lethalithy observed at the end of a 7-day period varied according t ... | 1991 | 1726952 |
| the epidemiologic importance of triatoma brasiliensis as a chagas disease vector in brazil: a revision of domiciliary captures during 1993-1999. | to clarify the epidemiologic importance of triatoma brasiliensis, the most important chagas disease vector in the northeastern of brazil, capture data related to this species, its distribution, capture index, and percentages of natural infection by trypanosoma cruzi were examined in 12 different brazilian states. the brazilian national health foundation collected these data from 1993 to 1999, a period during which a total of 1,591,280 triatomines (21 species) were captured in domiciles within th ... | 2003 | 12937751 |
| lipoprotein lipase in the fat body of triatoma brasiliensis. | lipoprotein lipase activity was detected and characterized in the fat body of triatoma brasiliensis one of the vector of chagas' disease. the enzyme activity was close to a free fatty acid production of 47 mumol ffa mg protein-1-h-1 when assayed in the complete system. 2. the enzyme presented maximum activity at ph 8.5. it appeared to be activated by heparin (2 u/ml) and to require a cofactor (rat serum lipoproteins) when assayed with simple triglyceride emulsions. the requirement for a ffa acc ... | 1976 | 60918 |
| [triatoma brasiliensis neiva, 1911 (hemiptera, reduviidae): observations on dynamics of feeding behavior in an artificial ecotope]. | in order to study the behavior of triatomine bugs under artificial ecotopic conditions, an experimental, double-walled poultry coop was built. its inside walls were made of sun-dried clay blocks which could be broken apart for better access to the insects hiding in their crevices. the coop was subdivided into two main areas of different sizes using wire netting and a wall made of perforated bricks. the chickens, the only food source available for the triatomines, were kept in the larger, rectang ... | 2003 | 14528333 |
| wild habitat and related fauna of panstrongylus lutzi (reduviidae, triatominae). | although panstrongylus lutzi (neiva and pinto) is currently the fifth most frequent species of triatominae captured in artificial structures in brazil, its silvatic habitat remains unknown. a survey of its natural ecotopes was performed in an area of bahia state. p. lutzi nymphal instars and adults were detected in burrows of dasypodidae. silvatic habitat of four other endemic triatomine species of the caatinga (triatoma pseudomaculata correa and espinola, triatoma brasiliensis neiva, rhodnius n ... | 2003 | 14765681 |
| nested clade and phylogeographic analyses of the chagas disease vector triatoma brasiliensis in northeast brazil. | triatoma brasiliensis (hemiptera: reduviidae: triatominae) is the most important chagas disease vector in the semiarid areas of northeast brazil. we analyzed mitochondrial cytochrome b sequence variation among 136 individuals representing 16 populations from across the species' distribution. neighbor-joining and parsimony tree-building methods were used in conjunction with nested clade analysis to describe the systematics and phylogeography of this species. our results indicate that t. brasilien ... | 2004 | 15186796 |
| epidemiology of chagas disease in jaguaruana, ceará, brazil. i. presence of triatomines and index of trypanosoma cruzi infection in four localities of a rural area. | in order to assay the triatomine infestation and domiciliation in the rural area of jaguaruana district, state of ceará, brazil, we studied, from november 2000 to april 2002, 4 localities comprising 158 domiciles as a whole, with an average of 4 inhabitants/house, who are dwelling in there for more than 7 years. most houses have tile-covered roofs and the walls built with plaster-covered bricks (57%), followed by bricks without plaster (33%), and mud walls (7.5%). a total of 3082 triatomines wer ... | 2004 | 15273797 |
| influence of the blood meal source on the development of triatoma infestans, triatoma brasiliensis, triatoma sordida, and triatoma pseudomaculata (heteroptera, reduviidae). | the objective of this study was to determine the influence of the blood meal source on the life cycle and reproductive development of female triatoma infestans (klug, 1834), triatoma brasiliensis neiva, 1911, triatoma sordida (stal, 1859), and triatoma pseudomaculata corrga & espfinola, 1964. in all triatomine species studied the life cycle was shorter for the groups fed on mice than for those fed on pigeons, the range of differences being between 1.5 times (t pseudomaculata and t. infestans) an ... | 2000 | 15535580 |
| sulfated glycosaminoglycans in two hematophagous arthropod vectors of chagas disease, triatoma brasiliensis and rhodnius prolixus (hemiptera: reduviidae). | the characterization of sulfated glycosaminoglycans (gags) in hematophagous arthropod vectors in general has been limited, with the exception of the studies in the triatomine rhodnius prolixus. heparan sulfate (hs) and chondroitin sulfate (cs) were previously identified and structurally characterized in extracts of whole bodies of fourth instar larvae of r. prolixus. recently, we showed the expression of these two sulfated gags in specific body tissues of adult males and females and in embryos o ... | 2004 | 15581795 |
| dynamics between sylvatic, peridomestic and domestic populations of triatoma brasiliensis (hemiptera: reduviidae) in ceara state, northeastern brazil. | triatoma brasiliensis is the most important chagas disease vector in the drier regions of the "brazilian caatinga", colonizing both sylvatic and domestic environments, usually forming abundant colonies. control trials using insecticides against domestic and peridomestic populations suggest that the t. brasiliensis has a high capacity to repopulate treated habitats from the neighboring sylvatic populations, making its elimination more complex. the aim of this work was to determine genetic variabi ... | 2005 | 15589804 |
| risk factors for reinvasion of human dwellings by sylvatic triatomines in northern bahia state, brazil. | the aim of this study in curaça, bahia, northeast brazil was to explore possible factors associated with the infestation of human dwellings by triatoma brasiliensis or triatoma pseudomaculata, two sylvatic triatomine species. we use multiple logistic regression analysis to show how structural features of the peridomiciliary area combine with the number of animals and sociological factors to allow infestation of some dwellings. it is suggested that t. brasiliensis is associated with human activit ... | 2005 | 15868058 |
| aspects of peridomiciliary ecotopes in rural areas of northeastern brazil associated to triatomine (hemiptera, reduviidae) infestation, vectors of chagas disease. | artificial ecotopes of 121 peridomiciliary environments in four rural localities in the state of ceará, brazil, were studied and the type of material of the ecotopes was identified as triatomine infestation. two thousand two hundred and four triatoma brasiliensis neiva, 340 triatoma pseudomaculata corrêa and espínola, 121 rhodnius nasutus stall, and 5 panstrongylus lutzi (neiva and pinto) were captured. out of the 323 ecotopes found (x = 2.0 +/- 1.8 per dwelling) - such as pigpens, henhouses, co ... | 2006 | 16830706 |
| [biogeography, origin, and distribution of triatominae domiciliarity in brazil. revista de saúde pública, 14(3):265-99, 1980]. | an association is established between the brazilian geographical pattern of the domiciliarity of the triatominae bugs and open lands characterized by natural savanna vegetation or artificial, man-made landscapes. the brazilian open lands involved are the "caatingas'' and "cerrados", both wholly included in brazilian territory, while the mixed southern subtropical prairies belong to systems extending bevond national boundary lines. the other open lands are anthropic-lands opened mainly by the des ... | 2006 | 17173153 |
| flight dispersal of the chagas disease vectors triatoma brasiliensis and triatoma pseudomaculata in northeastern brazil. | the present paper reports for the first time the capture of wild triatoma brasiliensis and triatoma pseudomaculata by means of light traps in brazil. we tested commercially available lighting devices powered by batteries to attract the bugs to a white piece of cloth in the field. two main findings showed to be significant: first, the results presented here show that light traps can be used for sampling these species in wild environments; second, they reveal that house colonization by triatomines ... | 2007 | 17292320 |
| the use of aggregation signals by triatoma brasiliensis (heteroptera: reduviidae). | triatoma brasiliensis is considered the main vector of chagas disease in the semiarid zones of north-eastern brazil. in this work, we describe the spatial pattern of defecation in t. brasiliensis and the spatial relationship of faeces with the shelters of these bugs. afterwards, we analyse the attraction response of t. brasiliensis larvae to potential odour cues present in their dry faeces, to substances present in their cuticule (footprints) and to the dry faeces of triatoma pseudomaculata. we ... | 2007 | 17306752 |
| mapping of the distribution of trypanosoma cruzi infection among small wild mammals in a conservation unit and its surroundings (northeast-brazil). | maps are a useful tool that permits correlation of landscapes with hotspots of parasite transmission. here, they were used as a tool for geovisualization to evaluate variables involved in the transmission of trypanosoma cruzi among small wild mammals in an area endemic for chagas disease, the "serra da capivara" national park (parna) and its surroundings in piauí state, northeast brazil. the implementation of a geographical information system (gis) allowed the observation that a previously noted ... | 2007 | 17307027 |
| growth behaviour of two trypanosoma cruzi strains in single and mixed infections: in vitro and in the intestinal tract of the blood-sucking bug, triatoma brasiliensis. | competition and cooperation are well-recognized biological phenomena, even among parasites. co-infection of parasites in a single host leads to several outcomes, one being competition for a limited resource. here, the behaviour of mixed infection was evaluated using two isolates of trypanosoma cruzi, previously typed as belonging to genotypes tci and tcii. the growth in vitro and in the different compartments of the gut of triatoma brasiliensis was studied. in vitro growth showed that mdid/br/19 ... | 2007 | 17374352 |
| the sialotranscriptome of the blood-sucking bug triatoma brasiliensis (hemiptera, triatominae). | triatoma brasiliensis is the most important autochthon vector of trypanosoma cruzi in brazil, where it is widely distributed in the semiarid areas of the northeast. in order to advance the knowledge of the salivary biomolecules of triatominae, a salivary gland cdna library of t. brasiliensis was mass sequenced and analyzed. polypeptides were sequenced by hplc/edman degradation experiments. then 1712 cdna sequences were obtained and grouped in 786 clusters. the housekeeping category had 24.4% and ... | 2007 | 17550826 |
| brasiliensin: a novel intestinal thrombin inhibitor from triatoma brasiliensis (hemiptera: reduviidae) with an important role in blood intake. | every hematophagous invertebrate studied to date produces at least one inhibitor of coagulation. among these, thrombin inhibitors have most frequently been isolated. in order to study the thrombin inhibitor from triatoma brasiliensis and its biological significance for the bug, we sequenced the corresponding gene and evaluated its biological function. the t. brasiliensis intestinal thrombin inhibitor, termed brasiliensin, was sequenced and primers were designed to synthesize double strand rna (d ... | 2007 | 17575982 |
| first record of megaselia scalaris (loew) (diptera: phoridae) infesting laboratory colonies of triatoma brasiliensis neiva (hemiptera: reduviidae). | megaselia scalaris (loew) is a cosmopolitan and synanthropic scuttle fly, eclectic in its feeding habits and acts as detritivore, parasite, facultative parasite, and parasitoid. here we report for the first time m. scalaris infesting laboratory colonies of triatoma brasiliensis neiva, the most important chagas disease vector in semiarid areas of brazil. m. scalaris larvae were found feeding inside bugs; pupae were found in the esophagus and intestinal regions of t. brasiliensis through dissectio ... | 2007 | 18246279 |
| inferring from the cyt b gene the triatoma brasiliensis neiva, 1911 (hemiptera: reduviidae: triatominae) genetic structure and domiciliary infestation in the state of paraíba, brazil. | the triatoma brasiliensis genetic structure was analyzed using the cyt b gene in different geographic locations and ecotopes after a short and long period after insecticide treatment. four different localities (16-40 km apart) in the state of paraíba, brazil, were sampled. analysis of molecular variance (amova) showed that grouping populations according to the geographic location or ecotope resulted in a higher variance among populations within groups (phi(sc) ranging from 0.15 to 0.17) than amo ... | 2008 | 18458315 |
| microsatellite markers in triatoma pseudomaculata (hemiptera, reduviidae, triatominae), chagas' disease vector in brazil. | six polymorphic microsatellite loci were isolated and characterized using a microsatellite-enriched genomic library from the chagas' disease vector triatoma pseudomaculata. this species is found in brasil in caatinga areas and predominantly in peridomestic habitats. all the microsatellites tested on a population of t. pseudomaculata sampled in the bahia state, brazil, were polymorphic (2-15 alleles). markers amplification was also tested on six triatoma species and some loci successfully amplifi ... | 2008 | 18571993 |
| development of a trypanosoma cruzi (tci) isolate in the digestive tract of an unfamiliar vector, triatoma brasiliensis (hemiptera, reduviidae). | triatoma brasiliensis is an important vector of trypanosoma cruzi, commonly found in semi-arid areas of north-eastern brazil. t. cruzi (tci) is a widely distributed genotype in all biomes of brazil. to evaluate selective pressures exerted by a vector species on the development of tci derived from a different biome (atlantic rainforest), t. brasiliensis larvae were infected with the mdid/br/1994/c48 isolate. parasite densities of t. cruzi were determined in three regions of the gut at 3, 5 and 10 ... | 2008 | 18579102 |
| [epidemiology of chagas disease in four rural localities in jaguaruana, state of ceará: seroprevalence of infection, parasitemia and clinical characteristics]. | a cross-sectional study on chagas disease that examined the populations of four localities (n masculine = 541 inhabitants) in the municipality of jaguaruana, state of ceará, showed seroprevalence of chagas infection of 3.1%, as assessed by indirect immunofluorescence, indirect hemagglutination and elisa tests. the rate was higher among adults over 50 years old, without any difference in relation to sex. positive parasitemia was found in 11.8% (2/17) of the seropositive individuals by means of in ... | 2008 | 18853005 |
| crossing experiments detect genetic incompatibility among populations of triatoma brasiliensis neiva, 1911 (heteroptera, reduviidae, triatominae). | triatoma brasiliensis is composed of at least four geographic populations (brasiliensis, melanica, macromelasoma, and juazeiro) that have distinct chromatic, morphologic, biologic and ecologic patterns, and genetic composition. reciprocal crosses between all pairwise combinations were carried out in order to evaluate the genetic and reproductive compatibility of these four populations. the f1 individuals developed normally and the resulting adults were crossed again to test the f2 and f3 viabili ... | 2003 | 12973530 |
| two novel defensin-encoding genes of the chagas disease vector triatoma brasiliensis (reduviidae, triatominae): gene expression and peptide-structure modeling. | defensins are cysteine-rich peptides involved in the innate immunity of insects and many other organisms. in the present study, two novel defensin-encoding cdnas and the respective genomic dnas (def3 and def4) of triatoma brasiliensis were identified and their tissue-specific and temporal expression was characterized. both of the deduced mature peptides consisted of 43 amino acid residues and were highly similar to previously identified triatomine defensins (81.4-100%). semi-quantitative rt-pcr ... | 2009 | 19505471 |
| effect of intestinal erythrocyte agglutination on the feeding performance of triatoma brasiliensis (hemiptera: reduviidae). | triatoma brasiliensis is an important vector of trypanosoma cruzi in brazil. the feeding efficiency on its hosts depends on several parameters including the maintenance of the ingested blood at low viscosity, which could be modulated by the anterior midgut (crop) anticoagulant and haemagglutinant activities. in the present study, we characterized t. brasiliensis crop haemagglutination activity and evaluated its importance in the feeding process. soluble crop contents (scc) of t. brasiliensis wer ... | 2009 | 19524588 |
| the role of salivary and intestinal complement system inhibitors in the midgut protection of triatomines and mosquitoes. | saliva of haematophagous arthropods contain biomolecules involved directly or indirectly with the haematophagy process, and among them are encountered some complement system inhibitors. the most obvious function for these inhibitors would be the protection of the midgut against injury by the complement. to investigate this hypothesis, triatoma brasiliensis nymphs were forced to ingest human serum in conditions in which the protection of midgut by the inhibitors is bypassed. in these conditions, ... | 2009 | 19557176 |
| copulation and mate guarding behavior in triatoma brasiliensis (hemiptera: reduviidae). | the hematophagous bug triatoma brasiliensis (neiva) is an important vector of chagas disease in brazil. we describe the mating behavior of this species in a comparative manner and analyze the effect of time elapsed since the first imaginal bloodmeal on motivation of males to mate, on female mate-rejections, and on overall mating frequency. we also evaluate whether females of this species copulate with several males in short time intervals, and we examine whether the duration of copulation may va ... | 2009 | 19645281 |
| biology, diversity and strategies for the monitoring and control of triatomines--chagas disease vectors. | despite the relevant achievements in the control of the main chagas disease vectors triatoma infestans and rhodnius prolixus, several factors still promote the risk of infection. the disease is a real threat to the poor rural regions of several countries in latin america. the current situation in brazil requires renewed attention due to its high diversity of triatomine species and to the rapid and drastic environmental changes that are occurring. using the biology, behaviour and diversity of tri ... | 2009 | 19753457 |
| immunogenic salivary proteins of triatoma infestans: development of a recombinant antigen for the detection of low-level infestation of triatomines. | triatomines are vectors of trypanosoma cruzi, the etiological agent of chagas disease in latin america. the most effective vector, triatoma infestans, has been controlled successfully in much of latin america using insecticide spraying. though rarely undertaken, surveillance programs are necessary in order to identify new infestations and estimate the intensity of triatomine bug infestations in domestic and peridomestic habitats. since hosts exposed to triatomines develop immune responses to sal ... | 2009 | 19841746 |
| phylogeny of triatoma sherlocki (hemiptera: reduviidae: triatominae) inferred from two mitochondrial genes suggests its location within the triatoma brasiliensis complex. | the phylogenetic position of triatoma sherlocki within triatomines group was inferred by analyzing mtdna fragments of cyt b and 16s ribosomal rna by using maximum parsimony and bayesian analysis. despite being differentiated from members of the t. brasiliensis complex on morphologic grounds, molecular phylogenetic analysis suggests t. sherlocki is a member of this complex; moreover, it was placed as a sister species of t. melanica. these suggestions were supported by robust credibility rates. he ... | 2009 | 19861622 |
| behavioral and electrophysiological responses of triatoma brasiliensis males to volatiles produced in the metasternal glands of females. | in many insects, mate finding is mediated by volatile sex pheromones, but evidence for this phenomenon in triatomines (heteroptera: reduviidae) is still fragmentary. recently, it was shown that metasternal glands (mgs) are involved in producing signals related to the sexual communication of triatoma infestans and rhodnius prolixus. based on this, we tested whether mg volatiles could be involved in the sexual communication of triatoma brasiliensis. odor-mediated orientation responses were studied ... | 2009 | 19902303 |
| influence of blood meal and mating in reproduction patterns of triatoma brasiliensis females (hemiptera: reduviidae) under laboratory conditions. | the influence of blood meal and mating on triatoma brasiliensis (neiva) female fecundity, fertility, life-span and the preoviposition period were investigated under laboratory conditions. nourishment increased fecundity, fertility and adult lifespan, whereas mating increased fecundity, fertility and decreased the preoviposition period. females also required more than one mating to reach their full reproductive potential. results indicate that both nourishment and mating are important in t. brasi ... | 2009 | 20027473 |
| surveillance of chagas disease vectors in municipalities of the state of ceará, brazil. | the present study aimed to analyse the dwelling infestation rates and the distribution and natural trypanosoma cruzi infection rates, among triatomines captured in the 13 municipalities of the state of ceará. the records relating to the capture of intradomicile and peridomicile triatomines during the chagas disease control program of 1998-2008 were available. among the triatomines captured and in all of the municipalities studied, triatoma brasiliensis presented the highest incidence in intradom ... | 2009 | 20140377 |
| susceptibility of triatoma brasiliensis from state of ceará, northeastern brazil, to the pyrethroid deltamethrin. | after controlling triatoma infestans in brazil, other species of triatomine that were considered minor in the transmission of chagas disease became important. the persistence of triatoma brasiliensis in northeastern brazil, associated with reinfection of domestic environments recently sprayed with pyrethroids, may be a signal of susceptibility alteration of this species to this insecticide. specimens of t. brasiliensis from the municipality of tauá, state of ceará, were captured before and one y ... | 2010 | 20512253 |
| trypanosoma cruzi infection modulates the expression of triatoma brasiliensis def1 in the midgut. | abstract antimicrobial peptides are an essential component of the insect immune system. one of the most ubiquitous is defensin, which has been identified in all examined insect orders. triatoma brasiliensis (heteroptera, triatominae), the main trypanosoma cruzi vector in semi-arid regions of north-eastern brazil, expresses def1, a defensin encoding gene, predominantly in the anterior region (cardia and stomach) of the midgut. in the present study, we compared the transcript abundance of t. brasi ... | 2010 | 20925526 |
| ecology of triatoma brasiliensis in northeastern brazil: seasonal distribution, feeding resources, and trypanosoma cruzi infection in a sylvatic population. | we assessed some ecological parameters of triatoma brasiliensis in rock piles in the state of ceará during the rainy and dry seasons. the greatest density was in april (median = 12.5 triatomines/site). the greatest abundance was in december, when the insects were more dispersed and the density per site was lower (6 triatomines/site). the nutritional status of females and 5th instar nymphs was increased in july. the rate of t. cruzi infection reached its highest peak in july (10.9%). elisa reveal ... | 2010 | 21175946 |
| developmental and reproductive patterns of triatoma brasiliensis infected with trypanosoma cruzi under laboratory conditions. | the aim of this work was to study the interaction between trypanosoma cruzi-1 and triatoma brasiliensis. a group of 1st instar nymphs was initially fed on t. cruzi-infected mice and a control group was fed on uninfected mice. from the second feeding onwards, both groups were otherwise fed on non-infected mice. the resulting adults were grouped in pairs: infected male/uninfected female, uninfected male/infected female, infected male and female and uninfected male/uninfected female. the infection ... | 2010 | 21225206 |
| feeding performance of triatoma brasiliensis (hemiptera: reduviidae) on habitual hosts: thrichomys laurentius (rodentia: echimyidae) and humans. | triatoma brasiliensis is an important vector of trypanosoma cruzi in the semiarid zones of northeastern brazil where it is commonly found in human dwellings, peridomiciliary areas, and the wild environments. to better understand features that may be influencing the interaction of t. brasiliensis with its hosts, in the present work we compared the feeding performance of sylvatic and domestic populations of t. brasiliensis on humans and on thrichomys laurentius, a wild rodent found in the natural ... | 2011 | 21395421 |
| influence of the intestinal anticoagulant in the feeding performance of triatomine bugs (hemiptera; reduviidae). | triatomines are haematophagous insects in all post-embryonic life stages. they are vectors of trypanosoma cruzi, the causative agent of chagas disease. their vectorial ability is influenced by their feeding performance, which varies greatly amongst species. recent work showed that inhibition of the coagulation process in the anterior midgut (crop) environment considerably influences the blood meal size. in this work, we performed a comparative study of the level of anticoagulant activity in the ... | 2011 | 21447340 |
| structure elucidation and synthesis of dioxolanes emitted by two triatoma species (hemiptera: reduviidae). | volatiles from the metasternal glands of two species of true bugs of the triatominae subfamily, triatoma brasiliensis and triatoma infestans, were analyzed by spme-gc/ms. two sets of new natural products were found: (4s,5s)- and (4r,5r)-2,2,4-triethyl-5-methyl-1,3-dioxolane (1) (major component) and (4s*,5s*)-2,4-diethyl-2,5-dimethyl-1,3-dioxolane (2) (trace component), (2r/s,4s,5s)- as well as (2r/s,4r,5r)-4-ethyl-5-methyl-2-(1-methylethyl)-1,3-dioxolane (3) (minor component), (2r/s,4s*,5s*)-4- ... | 2011 | 21486009 |
| [summary of results from the national surveys]. | this article aims to correlate the main results of three large national surveys on chagas disease (entomologic, seroprevalence and electrocardiographic) carried out in brazil from late 1970's to early 1980's, which served as baseline for definition of the control measures adopted in the country. the proportion of infected people was much higher in areas where triatoma infestans, the most efficient vector of chagas disease among the five principal species involved in transmission at that time, wa ... | 2011 | 21584357 |
| [the control of vectorial transmission]. | between 1950 and 1951, the first prophylactic campaign against chagas diseases was carried on in brazil by the so existing serviço nacional de malária. the actions involving chemical vector control comprehended 74 municipalities along the rio grande valley, between the states of são paulo and minas gerais. ever since, until 1975, the activities were performed according the availability of resources, being executed with more or less regularity and coverage. at that time, chagas disease did no rep ... | 2011 | 21584358 |
| ultrastructural localization of basic proteins and carbohydrates in male accessory glands of two triatoma species (hemiptera, reduviidae, triatominae). | the male accessory glands in triatoma are tubular and produce substances with some functions related to production of the spermatophore. in the current study, the cytochemistry of male accessory glands was evaluated in starved triatoma brasiliensis and adult triatoma melanica. the storage of carbohydrates and proteins in t. melanica male accessory glands occurs earlier than in t. brasiliensis. in addition, the occurrence of eletron-lucent granules without carbohydrates and proteins suggests that ... | 2011 | 21661307 |
| morphological evidence suggests homoploid hybridization as a possible mode of speciation in the triatominae (hemiptera, heteroptera, reduviidae). | all known significant insect vectors of trypanosoma cruzi are members of the reduviidae, subfamily triatominae. infections with this parasite are the cause of chagas disease, the single most costly parasitic disease in the western hemisphere. the triatominae are almost completely restricted to the americas, with >130 species distributed in several foci of species richness and endemism; nevertheless, the processes involved in the diversification of this group remain poorly understood. the triatom ... | 2009 | 19135177 |
| new perspectives for population genetics of chagas'disease vectors in the northeastern brazil: isolation of polymorphic microsatellite markers in triatoma brasiliensis. | triatoma brasiliensis is the most important chagas disease vector in semiarid areas of northeastern brazil. although generally found in natural environment, it regularly colonizes or reinvades domiciliary ecotopes. in order to analyse gene flow between habitats, we identified and characterized six microsatellite loci using a microsatellite-enriched genomic library. to assess the usefulness of these microsatellites for genetic studies, we investigated their variability in two natural populations ... | 2009 | 19460330 |
| the metasternal and brindley's glands of triatoma brasiliensis neiva (hemiptera: reduviidae). | triatoma brasiliensis neiva is the most important vector of the chagas' disease in the semiarid zones of north-eastern brazil. adult bugs have two main pairs of exocrine glands, the metasternal and the brindley's glands, which release volatiles possibly with defense, alarm and/or mating functions. to date, anatomical and histological studies of the metasternal and the brindley's glands in the genus triatoma are scarce and, considering the relevance of these exocrine glands, the present work aime ... | 2009 | 19488512 |
| eco-epidemiology of chagas disease in northeastern brazil: triatoma brasiliensis, t. pseudomaculata and rhodnius nasutus in the sylvatic, peridomestic and domestic environments. | an entomological survey was carried out in four rural localities situated in the state of ceará, assessing chagas disease seroprevalence in man, focusing on the presence of vectors in natural foci contiguous to the domestic and peridomestic environments. fifty-three triatoma brasiliensis, nine t. pseudomaculata and 71 rhodnius nasutus were collected in their natural habitats as far as 10 m from the houses, and 663, 59 and 8 respectively were captured in peridomestic artificial structures, adjace ... | 2011 | 21979785 |
| Combining geospatial analysis and exploratory study of triatomine ecology to evaluate the risk of Chagas disease in a rural locality. | The use of geo-spatial analysis to anticipate transmission risk for Chagas disease was tested in a rural area of northeast Brazil in an approach that combined geo-referencing and exploratory study of triatomine infestation, including related elements such as the environment and hosts. A total of 617 triatomine specimens, mainly Triatoma brasiliensis, were captured, exhibiting an overall T. cruzi positivity of 44.4%. Layer analysis indicated that the greatest transmission risk to man was associat ... | 2012 | 22015423 |
| [resistence of triatoma brasiliensis to fasting]. | | 2015 | 4596930 |
| under-expression of chemosensory genes in domiciliary bugs of the chagas disease vector triatoma brasiliensis. | in latin america, the bloodsucking bugs triatominae are vectors of trypanosoma cruzi, the parasite that causes chagas disease. chemical elimination programs have been launched to control chagas disease vectors. however, the disease persists because native vectors from sylvatic habitats are able to (re)colonize houses-a process called domiciliation. triatoma brasiliensis is one example. because the chemosensory system allows insects to interact with their environment and plays a key role in insec ... | 2016 | 27792774 |
| prevalence of american trypanosomiasis and leishmaniases in domestic dogs in a rural area of the municipality of são joão do piauí, piauí state, brazil. | chagas disease and the leishmaniases are endemic zoonoses of great importance to public health in the state of piauí, brazil. the domestic dog (canis familiaris) is a major reservoir, host of trypanosoma cruzi and leishmania spp. in both urban and rural areas, playing an important role in the transmission of these parasites. the present study evaluated the prevalence of both infectious diseases in dogs of a rural area in the municipality of são joão do piauí, piauí state. one hundred twenty-nine ... | 2016 | 27828620 |
| molecular identification of food sources in triatomines in the brazilian northeast: roles of goats and rodents in chagas disease epidemiology. | we used the gut contents of triatomines collected from rural areas of ceará state, northeastern brazil, to identify their putative hosts via vertebrate cytb gene sequencing. successful direct sequencing was obtained for 48% of insects, comprising 50 triatoma brasiliensis, 7 triatoma pseudomaculata, and 1 rhodnius nasutus. basic local alignment search tool (blast) procedure revealed that domestic animals, such as chickens (gallus gallus) and goats (capra hircus), are the main food source, includi ... | 2015 | 26350453 |
| domestic, peridomestic and wild hosts in the transmission of trypanosoma cruzi in the caatinga area colonised by triatoma brasiliensis. | the role played by different mammal species in the maintenance of trypanosoma cruzi is not constant and varies in time and place. this study aimed to characterise the importance of domestic, wild and peridomestic hosts in the transmission of t. cruzi in tauá, state of ceará, caatinga area, brazil, with an emphasis on those environments colonised by triatoma brasiliensis. direct parasitological examinations were performed on insects and mammals, serologic tests were performed on household and out ... | 2014 | 25410992 |
| molecular individual-based approach on triatoma brasiliensis: inferences on triatomine foci, trypanosoma cruzi natural infection prevalence, parasite diversity and feeding sources. | we used an individual-based molecular multisource approach to assess the epidemiological importance of triatoma brasiliensis collected in distinct sites and ecotopes in rio grande do norte state, brazil. in the semi-arid zones of brazil, this blood sucking bug is the most important vector of trypanosoma cruzi--the parasite that causes chagas disease. first, cytochrome b (cytb) and microsatellite markers were used for inferences on the genetic structure of five populations (108 bugs). second, we ... | 2016 | 26891047 |
| characterization of the microbiota in the guts of triatoma brasiliensis and triatoma pseudomaculata infected by trypanosoma cruzi in natural conditions using culture independent methods. | chagas disease is caused by trypanosoma cruzi, which is transmitted by triatomine vectors. the northeastern region of brazil is endemic for chagas disease and has the largest diversity of triatomine species. t. cruzi development in its triatomine vector depends on diverse factors, including the composition of bacterial gut microbiota. | 2015 | 25903360 |
| triatomine bugs, their microbiota and trypanosoma cruzi: asymmetric responses of bacteria to an infected blood meal. | triatomine bugs (hemiptera: reduviidae) are vectors of the flagellate trypanosoma cruzi, the causative agent of chagas disease. the study of triatomine gut microbiota has gained relevance in the last years due to its possible role in vector competence and prospective use in control strategies. the objective of this study is to examine changes in the gut microbiota composition of triatomines in response to a t. cruzi-infected blood meal and identifying key factors determining those changes. | 2016 | 27938415 |
| vector capacity of members of triatoma brasiliensis species complex: the need to extend chagas disease surveillance to triatoma melanica. | we conducted a lab-based comparative study on vector capacity features of two species of triatomines: triatoma brasiliensis and t. melanica. both are members of the t. brasiliensis species complex. the former is the most important chagas disease vector in the northeastern region of brazil. to date, no transmission via t. melanica has been recorded. immature insects exhibited distinct intermoult periods without a direct relationship to a given species. females of t. brasiliensis consumed an avera ... | 2016 | 27232124 |
| characteristics of triatomine infestation and natural trypanosoma cruzi infection in the state of rio grande do norte, brazil. | introduction natural and artificial ecotope infestation by the kissing bug triatomines and their colonization and infection by trypanosoma cruzi , the chagas disease agent, were evaluated in nine municipalities of the state of rio grande do norte, brazil. methods following identification, triatomine intestinal contents were analyzed by direct microscopic examination, xenoculture, and polymerase chain reaction (pcr) for parasite detection. trypanosoma cruzi isolates were genotyped using three dif ... | 2016 | 27163565 |
| reproductive biology of triatoma brasiliensis (hemiptera, triatominae) during the imaginal molt. | the triatomines are vectors of the protozoan trypanosoma cruzi, etiologic agent of chagas disease. these insects are sexually active after the imaginal molt. some aspects have been studied in triatoma brasiliensis during the imaginal molt, such as autogeny in virgin females and the relationship between blood ingestion by fifth instar nymph and the realization of the imaginal molt. thus, to aid in the understanding of reproductive biology and developmental physiology of these vectors, this articl ... | 2016 | 26787143 |
| does triatoma brasiliensis occupy the same environmental niche space as triatoma melanica? | triatomines (hemiptera, reduviidae) are vectors of trypanosoma cruzi, the causative agent of chagas disease, one of the most important vector-borne diseases in latin america. this study compares the environmental niche spaces of triatoma brasiliensis and triatoma melanica using ecological niche modelling and reports findings on dna barcoding and wing geometric morphometrics as tools for the identification of these species. | 2015 | 26156398 |
| are members of the triatoma brasiliensis (hemiptera, reduviidae) species complex able to alter the biology and virulence of a trypanosoma cruzi strain? | trypanosoma cruzi is the causative agent of chagas disease, transmitted to humans and mammals by blood-sucking hemipteran insects belonging to the triatominae subfamily. the two main genotypes of t. cruzi (tci and tcii) differ in many characteristics concerning their genetic profile. despite the extensive literature on vectors and the etiologic agent, several interactive aspects between these two elements of chagas disease are still waiting to be further clarified. here, biological and histologi ... | 2015 | 26013138 |
| toxicological profile of deltamethrin in triatoma brasiliensis (hemiptera: reduviidae) in state of ceará, northeastern brazil. | triatoma brasiliensis is the species of greatest epidemiological relevance in the semi-arid region of brazil. this species is predominantly found in domestic environments, and it has the ability to build large colonies with high levels of natural infection via trypanosoma cruzi. thus, t. brasiliensis is one of the most efficient transmitters of chagas disease (cd) to humans. despite household spraying with residual insecticides, many areas report persistent reinfestations for reasons that remain ... | 2015 | 25860462 |
| the main sceneries of chagas disease transmission. the vectors, blood and oral transmissions--a comprehensive review. | this review deals with transmission of trypanosoma cruzi by the most important domestic vectors, blood transfusion and oral intake. among the vectors, triatoma infestans, panstrongylus megistus, rhodnius prolixus, triatoma dimidiata, triatoma brasiliensis, triatoma pseudomaculata, triatoma sordida, triatoma maculata, panstrongylus geniculatus, rhodnius ecuadoriensis and rhodnius pallescens can be highlighted. transmission of chagas infection, which has been brought under control in some countrie ... | 2015 | 25466622 |
| domestic, peridomestic and wild hosts in the transmission of trypanosoma cruzi in the caatinga area colonised by triatoma brasiliensis. | the role played by different mammal species in the maintenance of trypanosoma cruzi is not constant and varies in time and place. this study aimed to characterise the importance of domestic, wild and peridomestic hosts in the transmission of t. cruzi in tauá, state of ceará, caatinga area, brazil, with an emphasis on those environments colonised by triatoma brasiliensis. direct parasitological examinations were performed on insects and mammals, serologic tests were performed on household and out ... | 2014 | 25165976 |
| simulating population genetics of pathogen vectors in changing landscapes: guidelines and application with triatoma brasiliensis. | understanding the mechanisms that influence the population dynamics and spatial genetic structure of the vectors of pathogens infecting humans is a central issue in tropical epidemiology. in view of the rapid changes in the features of landscape pathogen vectors live in, this issue requires new methods that consider both natural and human systems and their interactions. in this context, individual-based model (ibm) simulations represent powerful yet poorly developed approaches to explore the res ... | 2014 | 25102068 |
| an entomoepidemiological investigation of chagas disease in the state of ceará, northeast region of brazil. | the seroprevalence of chagas disease in humans and the presence of triatomines were investigated in a rural locality in the state of ceará, brazil, an historically endemic region. approximately 80% of the surveyed residents agreed to undergo serological tests. intradomestic and peridomestic environments were searched for triatomines in both the dry and rainy seasons. the prevalence rate of chagas disease was 1.2% and the majority of individuals confirmed with the disease over 50 years of age. a ... | 2014 | 24896053 |
| evaluation of rbcl and crclôéâ as markers of triatoma brasiliensis (hemiptera: reduviidae) nymphs: persistence and influence of rb and cr on triatomine biology. | in order to mark triatoma brasiliensis, the vector of chagas disease in brazil, two chemical compounds, rubidium chloride (rbcl) and chromium chloride (crclôéâ), were tested. first, 199 n2-n5 nymphs were fed on blood with 0.025m rbcl. rb marker positivity ranged from 2.5% (n3)-70% (n2), with a maximum persistence of 98 days. second, 265 n2-n5 nymphs were fed on blood containing 0.0015m crclôéâ. cr marker positivity ranged up to 93% (n5), with a maximum persistence of 119 days. finally, we blood ... | 2011 | 21739023 |
| distributional potential of the triatoma brasiliensis species complex at present and under scenarios of future climate conditions. | the triatoma brasiliensis complex is a monophyletic group, comprising three species, one of which includes two subspecific taxa, distributed across 12 brazilian states, in the caatinga and cerrado biomes. members of the complex are diverse in terms of epidemiological importance, morphology, biology, ecology, and genetics. triatoma b. brasiliensis is the most disease-relevant member of the complex in terms of epidemiology, extensive distribution, broad feeding preferences, broad ecological distri ... | 2014 | 24886587 |
| cathepsin l of triatoma brasiliensis (reduviidae, triatominae): sequence characterization, expression pattern and zymography. | triatoma brasiliensis is considered one of the main vectors of chagas disease commonly found in semi-arid areas of northeastern brazil. these insects use proteases, such as carboxypeptidase b, aminopeptidases and different cathepsins for blood digestion. in the present study, two genes encoding cathepsin l from the midgut of t. brasiliensis were identified and characterized. mature t. brasiliensis cathepsin l-like proteinases (tbcatl-1, tbcatl-2) showed a high level of identity to the cathepsin ... | 2012 | 22100382 |
| homogeneity of trypanosoma cruzi i, ii, and iii populations and the overlap of wild and domestic transmission cycles by triatoma brasiliensis in northeastern brazil. | the genetic variability of 24 trypanosoma cruzi isolates from humans (11) and triatomines (13) in northeastern brazil was analyzed by random amplified polymorphic dna (rapd) and compared with taxonomic groups, host, and geographical origin of the parasite. tci (12.5%), tcii (45.8%), and tciii (41.6%) showed a similarity coefficient (sc) of 0.74 using the mean of three primers and 0.80, 0.75, and 0.66 for λgt11-f, m13-40f, and l15996 primers, respectively. the samples were clustered according to ... | 2013 | 23371496 |
| synanthropic triatomines (hemiptera, reduviidae) in the state of pernambuco, brazil: geographical distribution and natural trypanosoma infection rates between 2006 and 2007. | the present study shows a descriptive analysis of triatomine occurrence and its natural trypanosoma infection rates in the state of pernambuco, brazil, between 2006 and 2007. | 2012 | 22370830 |
| [peridomiciliary changes and implications for triatoma brasiliensis control]. | a total of 9,906 annexes from 1,541 rural dwellings of boa viagem county, ceará, brazil, infested by triatoma brasiliensis and triatoma pseudomaculata were investigated and immediately sprayed with pyrethroid insecticide, followed by revisions at 6, 12, and 18 months. the initial infestation rate of annexes was 4.0%, with predominant infestation in animal shelters (7.0%). mean insect density was low, regardless of triatomine species or type of annex. a progressive decrease in the number of initi ... | 2000 | 11119322 |