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[prevalence of trypanosoma cruzi infection in opossum (didelphis albiventris) in santiago del estero, argentina].the opossum of the genus didelphis is one of the principal wild reservoirs of trypanosoma cruzi and is widely distributed in the western hemisphere. didelphis albiventris is the most common marsupial in amamá and trinidad, two communities in the province of santiago del estero, argentina. the d. albiventris population is replaced every year, and the opossum normally has two reproductive periods, one at the beginning of the spring and another at the beginning of the summer. the two litters are we ...199910659667
isolation of sarcocystis speeri dubey and lindsay, 1999 parasite from the south american opossum (didelphis albiventris) from argentina.sarcocystis sporocysts from the intestines of 2 opossums (didelphis albiventris) from argentina were fed to gamma-interferon knockout (ko) and nude mice. protozoal schizonts were seen in brain, liver, spleen, and adrenal glands of mice examined 33-64 days after feeding sporocysts. sarcocysts were seen in skeletal muscles of ko mice 34-71 days after feeding sporocysts. schizonts and sarcocysts were structurally similar to sarcocystis speeri dubey and lindsay, 1999 seen in mice fed sporocysts from ...200010701583
natural infections of leishmania peruviana in animals in the peruvian andes.evidence that domestic dogs may act as reservoir hosts for cutaneous leishmaniasis in the peruvian andes is provided by the isolation, for the first time, from naturally infected dogs of parasites identified (by isoenzymes) as leishmania peruviana. leishmania parasites were isolated from nasal aspirates or biopsies from 5 (1.8%) of 279 asymptomatic dogs samples in endemic villages of the peruvian andes. in addition, leishmania (viannia) infections were identified in 15 (5.4%) of 276 nasal sample ...199910492779
experimental transmission of sarcocystis speeri dubey and lindsay, 1999 from the south american opossum (didelphis albiventris) to the north american opossum (didelphis virginiana).sarcocystis speeri dubey and lindsay, 1999 from the south american opossum didelphis albiventris was successfully transmitted to the north american opossum didelphis virginiana. sporocysts from a naturally infected d. albiventris from argentina were fed to 2 gamma-interferon knockout (ko) mice. the mice were killed 64 and 71 days after sporocyst feeding (daf). muscles containing sarcocysts from the ko mouse killed 71 daf were fed to a captive d. virginiana; this opossum shed sporocysts 11 days a ...200010864267
in vitro cultivation of schizonts of sarcocystis speeri dubey and lindsay, 1999.schizonts of sarcocystis speeri dubey and lindsay, 1999 were cultured in vitro in bovine monocyte and equine kidney cell cultures inoculated with infected tissues of nude and gamma-interferon knockout mice fed sporocysts from opossums, didelphis albiventris. at least 1 asexual cycle was completed in 3 days. in vitro-grown merozoites were structurally and antigenically distinct from those of sarcocystis neurona and sarcocystis falcatula. culture-derived merozoites of s. speeri were not infective ...200010958438
[contribution to knowledge of reservoirs of trypanosoma cruzi (chagas, 1909) in corrientes province, argentina].in order to identify trypanosoma cruzi reservoirs in transmission areas, 60 mammals in capital and san luis del palmar departments, corrientes, argentina were studied. primates, rodents, carnivores, marsupials and edentates were investigated, 40 of them living in captivity and 20 caught with traps in a rural area. the mammals were examined by xenodiagnosis and third or fourth instars nymphs of triatoma infestans starved for 2 weeks were used. the feces were microscopically observed (400x) for tr ...199910380566
helminths of white-bellied opossum from brazil.helminths were collected from 22 specimens of the white-bellied opossum (didelphis albiventris) captured in the region of pampulha (belo horizonte, brazil), from may 1985 to march 1995. ten species of helminths were collected; these included rhopalias coronatus, brachylaema migrans, aspidodera raillieti, cruzia tentaculata, turgida turgida, gongylonema sp., viannaia hamata, travassostrongylus orloffi, trichuris didelphis and capillaria sp.199910231765
[first evidence of trypanosoma rangeli in the southeast of brazil, an endemic region for chagas' disease].this short communication informs the discovery of trypanosoma rangeli for the first time at triângulo mineiro region, south-east of brazil, a highly endemic area of chagas' disease and also the natural infection of didelphis albiventris with the same trypanosome. both the findings were demonstrated through blood smears, xenodiagnosis, microhematocrit technics and pcr. the last one was realized in faeces and hemolymph of triatoma infestans utilizing as controls strains of t. rangeli from colombia ...19989477704
inhibition of proteases, myotoxins and phospholipases a2 from bothrops venoms by the heteromeric protein complex of didelphis albiventris opossum serum.the antibothropic complex (abc) from opossum (species didelphis albiventris) serum was purified by chromatography on deae-sephacel. it showed an acidic character and two polypeptide chains of ca. 45 kda and 48 kda, respectively. lyophilized opossum serum or the abc (100 micrograms), as well as ethylenediamine tetraacetate (0.25 mumoles) were able to completely neutralise the hemorrhagic effect of 50 micrograms of the desiccated venoms of bothrops moojeni, bothrops pirajai and bothrops jararacuss ...19979415818
characterization of trypanosoma cruzi strains isolated from chronic chagasic patients, triatomines and opossums naturally infected from the state of rio grande do sul, brazil.thirty-five trypanosoma cruzi strains were isolated from chronic chagasic patients, triatomines and opossums from different municipalities of the state of rio grande do sul. parasites were characterized by means of mice infectivity, enzyme electrophoresis and randomly amplified polymorphic dna (rapd) analysis. twenty-nine strains were isolated from chagasic patients, 4 from triatomines (2 from triatoma infestans and 2 from panstrongylus megistus) and 2 from opossums didelphis albiventris. thirty ...19979332599
search for trypanosoma cruzi in the anal glands of wild didelphis albiventris from santiago del estero, argentina. 19958731365
interaction between didelphis albiventris and triatoma infestans in relation to trypanosoma cruzi transmission.this paper attempts to prove if a high trypanosoma cruzi prevalence of opossums might be reached with few potential infective contacts. one non-infected didelphis albiventris to t. cruzi and 10 infected nymphs of triatoma infestans were left together during 23 hr in a device that simulated a natural opossum burrow. twenty-six replicates were performed using marsupials and triatomines only once. potentially infective contacts occurred in all the trials. from the 26 opossums used in trials, 54% di ...19958731363
experimental infection of the opossum didelphis albiventris (marsupialia, didelphidae) with leishmania donovani. 19883249558
the importance of the opossum (didelphis albiventris) as a reservoir for trypanosoma cruzi in bambuí, minas gerais state.in a survey realized on the sylvatic and peridomestic environments at bambuí county, minas gerais state, 44 (37.9%) out of 116 opossums (didelphis albiventris) captured were found to be naturally infected with trypanosoma cruzi. one hundred and forty three parasite samples were obtained from 43 infected opossums using simultaneously hemoculture, xenodiagnosis (triatoma infestans, panstrongylus megistus and rhodnius neglectus) and examination of anal glands contents. the parasite samples were cha ...19911842405
immunocytochemical study of the ontogeny of the marsupial didelphis albiventris immune system.marsupials have considerable merits as models for studying the developmental dynamics of the mammalian immune system, but until recently there has been a conspicuous lack of specific immune probes to facilitate such studies. to begin a precise study of the ontogeny of the marsupial didelphis albiventris we have used cross-reactive polyclonal antibodies raised against evolutionarily highly conserved peptides which form part of the antigen specific receptor complexes of human differentiated lympho ...19957591984
[possibility of spontaneous cure in opossums (didelphis albiventris) naturally infected by trypanosoma cruzi]. 19947569616
ecological interactions of visceral leishmaniasis in the state of bahia, brazil.the laboratory and field observations summarized in this paper on visceral leishmaniasis ecology in the state of bahia, brazil are based on the author's observations over the past 35 years in a number of state's foci, public health records and literature citations. the disease is endemic with epidemic outbreaks occurring every ten years and its geographical distribution is expanding rapidly in the last years. leishmania chagasi is the main ethiologic agent of the visceral leishmaniasis but le. a ...19969283643
comparative patterns of postcranial ontogeny in therian mammals: an analysis of relative timing of ossification events.data on the relative sequence of ossification of postcranial elements for eight therian mammals (myotis lucifugus, homo sapiens, rattus norvegicus, mus musculus, mesocricetus auratus, cavia porcellus, didelphis albiventris, and sminthopsis macroura) and three outgroups (chelydra serpentina, alligator mississippiensis, and lacerta vivipara) were taken from the literature. for each species, a matrix was constructed in which the relative timing of the onset of ossification in 24 elements was summar ...200212362432
immunocytochemical study of peyer's patches follicular-associated epithelium in the marsupial, didelphis albiventris.the lack of probes defining leukocyte subpopulations has restricted ontogenetic studies of the opossum gut. we report for the first time the organization of the gut cellular immune components using species cross-reactive antibodies. mouse monoclonal antibodies against human hla-dr were used together with immunocytochemistry to demonstrate mhc class ii-like antigens in the opossum peyer's patches (pp). positive staining was obtained in the m cell and enterocytes comprising the follicular-associat ...19938299852
life-cycle and host specificity of amblyomma tigrinum (acari: ixodidae) under laboratory conditions.biological data of three generations of amblyomma tigrinum in the laboratory are reported and the suitability of different host species for immature ticks are compared. grouping the three generations, infestations by both the larval and nymphal stages were performed on chickens (gallus gallus), wistar rats (rattus norvegicus), rabbits (orytolagus cuniculus), wild mice (calomys callosus), dogs (canis familiaris) and opossums (didelphis albiventris). only dogs were used for infestations by adult t ...200212475081
natural infection of the opossum didelphis albiventris (marsupialia, didelphidae) with leishmania donovani, in brazil.an opossum, didelphis albiventris, from jacobina, bahia state, was found naturally infected with leishmania donovani, being the first non-canid wild mammal to be detected with the agent of kala-azar in the new world.19846533423
cytogenetic analysis of some brazilian marsupials (didelphidae: marsupialia).three species of marsupials from the amazon region (marmosa cinerea, caluromys lanatus, and didelphis marsupialis) and two from the region of são paulo (didelphis marsupialis and didelphis albiventris) were studied. the g-banding pattern of the species with 2n = 14 (m. cinerea and c. lanatus) was very similar, as well as the pattern of g-bands in the species with 22 chromosomes (didelphis). all of the autosomes of m. cinerea and d. albiventris have centromeric c-bands and the y chromosome is tot ...19863697826
animal reservoirs for trypanosoma cruzi infection in an endemic area in paraguay.animal reservoirs for trypanosoma cruzi infection were investigated in 5 communities in the department of san pedro, currently one of paraguay's most highly endemic areas. a total of 112 domestic animals (37 cattle, 2 horses, 1 ass, 20 pigs, 44 dogs and 8 cats) and 4 wild animals (1 white-eared opossum, 2 yellow armadillos and 1 common long-nosed armadillo) were examined for blood. although no trypomastigotes were found by 2 direct observation methods, the microhaematocrit and giemsa stained thi ...19948075219
[natural infection of the anal glands of the opossum (didelphis albiventris) by trypanosoma cruzi in the municipality of bambuí--mg, brazil].out of 87 opossums, didelphis albiventris, captured in the bambuí area (minas gerais state), 32 (36.7%) were found infected by trypanosoma cruzi; the rates varied according to whether the specimens originated from sylvan, rural peridomiciliar or urban surroundings, being 34.9, 81.8 and 7.7 respectively. from 20 of the infected opossums the anal glands were repeatedly examined and found positive in only one (5%) specimen (ga 9), with 7 positive examinations out of 17 performed through an 18-month ...19892108308
sylvatic american trypanosomiasis in argentina. trypanosoma cruzi infection in mammals from the chaco forest in santiago del estero.trypanosoma cruzi infection in sylvatic mammals of the quebracho woods of the eastern part of santiago del estero province, argentina, was studied from october 1984 to december 1987. 301 mammals of 20 different species were caught. t. cruzi, characterized biologically and biochemically, was isolated by xenodiagnosis from 23 of 72 (32%) didelphis albiventris opposums, 2/36 (5.5%) conepatus chinga skunks, and one ferret (galictis cuja). 53 opossum refuges were located and triatomine bugs were foun ...19921566301
search for borrelia sp. in ticks collected from potential reservoirs in an urban forest reserve in the state of mato grosso do sul, brazil: a short report.a total of 128 ticks of the genus amblyomma were recovered from 5 marsupials (didelphis albiventris) - with 4 recaptures - and 17 rodents (16 bolomys lasiurus and 1 rattus norvegicus) captured in an urban forest reserve in campo grande, state of mato grosso do sul, brazil. of the ticks collected, 95 (78.9%) were in larval form and 22 (21.1%) were nymphs; the only adult (0.8%) was identified as a. cajennense. viewed under dark-field microscopy in the fourth month after seeding, 9 cultures prepare ...200212219124
patterns of cardiovascular and respiratory responses evoked by stimulation of the defense area in the white-belly opossum (didelphis albiventris).the present study describes, for the first time, the autonomic changes concomitant to the defense reaction in the opossum. electrical stimulation of 2305 sites in the hypothalamus and brain stem evoked from 7% of them patterns of response including 40-240% muscle vasodilatation, characteristic of the defense reaction in anaesthetized animals. these responses also included a rise in arterial blood pressure, tachy- or bradycardia, and variable changes in ventilaton ranging from apneusis to polypne ...19873455266
[helping factors of the occlusion and oppening mechanisms of gastric cardiac region in opossum. comparative study to the man (author's transl)].the morphological factors that should work to help the cardial occlusion (esophageal and gastric mucosal folds) and are arranged to cooperate for the cardial oppening (smooth muscle fibres of the longitudinal layer of esophagus and stomach) are described in opossum (didelphis albiventris), comparatively to the man. also are comparatively discussed the anatomical disposition of diaphragm, esophageal hiatus of diaphragm, gastrophrenic ligament and phrenosophagical membrane.1979543562
characterization of sarcocystis falcatula isolates from the argentinian opossum, didelphis albiventris.two isolates of sarcocystis falcatula were obtained from the lungs of budgerigars (melopsittacus undulatus) fed sporocysts from two naturally-infected south american opossums (didelphis albiventris). the two isolates were designated sf-1a and sf-2a. both isolates induced fatal infections in budgerigars. both isolates underwent schizogony in african green monkey kidney cells. the structure of schizonts in the lungs of budgerigars was more variable than that observed in cell culture. the two isola ...200010847342
isolation of sarcocystis falcatula from the south american opossum (didelphis albiventris) from argentina.sarcocystis sporocysts from the intestines of four opossums (didelphis albiventris) from argentina were identified as sarcocystis falcatula based on schizogonic stages and pathogenicity to budgerigars (melopsittacus undulatus). seven budgerigars fed sporocysts from the opossum feces died of acute sarcocystosis 8, 9, 11, 12, and 14 days after inoculation. schizonts and merozoites found in the lungs and other organs of the budgerigars were identified as s. falcatula based on structure and immunore ...199910536981
life cycle of ixodes (ixodes) loricatus (acari: ixodidae) under laboratory conditions.the life cycle of ixodes (ixodes) loricatus neumann, reared in the laboratory, is described. engorged females collected from opossums trapped in the states of minas gerais and são paulo, brazil, which were used to start the laboratory colonies, were designated as bmg and csp, respectively. larval and nymphal ticks from both colonies fed separately on rattus norvergicus berkenhout or calomys callosus rengger, whereas didelphis marsupialis l and didelphis albiventris lund were used as hosts for bm ...200011004783
characterization of an unidentified sarcocystis falcatula-like parasite from the south american opossum, didelphis albiventris from brazil.an unidentified isolate of a sarcocystis falcatula-like parasite was obtained from the lungs of budgerigars (melopsittacus undulatus) fed sporocysts from a naturally-infected south american opossum, didelphis albiventris from brazil. four captive budgerigars fed sporocysts from the opossum intestine died of acute sarcocystosis 8, 10, and 12 days after oral inoculation (dai); one budgerigar was killed 12 dai when it was lethargic. schizonts and merozoites found in the lungs of the budgerigars rea ...200011128705
(t2ag3)n telomeric sequence hybridization suggestive of centric fusion in karyotype marsupials evolution.it has been suggested that the karyotype of the marsupials derived from a low diploid number (2n = 14) which originated, through fissions of biarmed chromosomes, the karyotypes with a higher 2n. the telomeric sequence (t2ag3)n was in situ hybridized to the chromosomes of gracilinanus microtarsus and g. emiliae, micoureus demerarae and marmosa murina, species with 2n = 14, in monodelphis sp., m. domestica, m. kunsi and m. brevicaudata with 2n = 18, and in lutreolina crassicaudata, didelphis albiv ...200011294606
molecular detection of paracoccidioides brasiliensis in road-killed wild animals.paracoccidioides brasiliensis infections have been little studied in wild and/or domestic animals, which may represent an important indicator of the presence of the pathogen in nature. road-killed wild animals have been used for surveillance of vectors of zoonotic pathogens and may offer new opportunities for eco-epidemiological studies of paracoccidiodomycosis (pcm). the presence of p. brasiliensis infection was evaluated by nested-pcr in tissue samples collected from 19 road-killed animals; 3 ...200817885959
histochemical and ultrastructural studies of mast cells in the intestinal mucosa and skin of the opossum didelphis albiventris.the mast cells located in the intestinal mucosa of a non-eutherian mammal were studied in comparison with those in the skin of the ear. in the intestinal mucosa, the mast cells exhibited a more variable shape, larger cytoplasmic granules and greater sensitivity to fixatives regarding their staining towards toluidine blue. ultrastructurally, these granules were more heterogeneous but lacked the crystalline content found in granules of skin mast cells; lipid body-like organelles were found only in ...19947515867
enzootic transmission of trypanosoma cruzi and t. rangeli in the federal district of brazil.the federal district of brazil (df) lies within the cerrado biome, where open shrubland (savannas) is interspersed with riverside gallery forests and permanent swamps (veredas). trypanosoma cruzi-infected native triatomines occur in the area, but the enzootic transmission of trypanosomatids remains poorly characterized. a parasitological survey involving sylvatic triatomines (166 rhodnius neglectus collected from mauritia flexuosa palms) and small mammals (98 marsupials and 70 rodents, totaling ...200415654478
the marsupial didelphis albiventris is an improbable host of paracoccidioides brasiliensis in an endemic area of paracoccidioidomycosis in minas gerais, brazil.to determine whether didelphis albiventris is naturally infected with paracoccidioides brasiliensis, 20 specimens of this mammal were studied by both direct cultivation of their viscera (spleen, liver and lungs) and by inoculation of swiss mice by the intraperitoneal route with a suspension of fragments of these viscera. no fungal growth or structures similar to this fungus were detected. probably d. albiventris is not frequently infected with p. brasiliensis.200111562699
sarcocystis lindsayi n. sp. (protozoa: sarcocystidae) from the south american opossum, didelphis albiventris from brazil.a new species, sarcocystis lindsayi n. sp., is proposed for a parasite resembling sarcocystis falcatula. it was obtained from the lungs and muscles of budgerigars (melopsittacus undulatus) fed sporocysts from a naturally-infected south american opossum, didelphis albiventris, from jaboticabal, brazil. sarcocysts of s. lindsayi n. sp. in budgerigars are microscopic, up to 600 microm long and up to 50 microm wide. the cyst wall is up to 2 microm thick. ultrastructurally, the sarcocyst wall consist ...200111596925
a survey of hemoparasite infections in free-ranging mammals and reptiles in french guiana.blood smears of 1,353 free-ranging mammals (35 species) and 112 reptiles (31 species) from french guiana were examined for hemoparasites. parasites from 3 major groups were recorded: apicomplexa (including hemogregarines, piroplasms, and plasmodium spp.), trypanosomatidae, and filaroidea. fifty percent of the individuals (86% of the species) were infected by parasites from at least 1 group. hemogregarines, identified as hepatozoon sp., infected numerous snakes with high prevalences (30-100%); in ...200011128476
first isolation of sarcocystis neurona from the south american opossum, didelphis albiventris, from brazil.sarcocystis neurona was isolated from sporocysts from two of eight south american opossums, didelphis albiventris, from brazil. interferon gamma gene knock out (ko) mice fed sporocysts from two opossums developed neurologic sarcocystosis. s. neurona was demonstrated in the brains of infected ko mice by immunohistochemical staining with anti-s. neurona antibody. the parasite was cultivated in cell culture and s. neurona dna was isolated from cultured merozoites. this is the first report of isolat ...200111223209
isolates of sarcocystis falcatula-like organisms from south american opossums didelphis marsupialis and didelphis albiventris from são paulo, brazil.isolates of sarcocystis falcatula-like organisms from south american opossums were characterized based on biological and morphological criteria. sporocysts from intestinal scrapings of 1 didelphis marsupialis and 8 didelphis albiventris from são paulo, brazil, were fed to captive budgerigars (melopsittacus undulatus). budgerigars fed sporocysts from all 9 isolates became ill and s. falcatula-like schizonts were identified in sections of their lungs by immunohistochemical staining. sarcocystis fa ...200111780836
a review of sarcocystis neurona and equine protozoal myeloencephalitis (epm).equine protozoal myeloencephalitis (epm) is a serious neurological disease of horses in the americas. the protozoan most commonly associated with epm is sarcocystis neurona. the complete life cycle of s. neurona is unknown, including its natural intermediate host that harbors its sarcocyst. opossums (didelphis virginiana, didelphis albiventris) are its definitive hosts. horses are considered its aberrant hosts because only schizonts and merozoites (no sarcocysts) are found in horses. epm-like di ...200111223193
oncicola martini sp. n., and other archiacanthocephala of the chaco boreal, paraguay.archiacanthocephalans are reported from mammals of paraguay. oncicola martini sp. n. is described from felis geoffroyi. it is most similar to o. lamasi (freitas et costa 1964) comb. n., differing in having larger hooks, all except the smallest of which are barbed. other species recorded are oncicola oncicola from felis geoffroyi (new host record), o. paracampanulata from felis yagouaroundi, o. luehei from nasua nasua, oligacanthorhynchus microcephala from didelphis albiventris, and o. tortuosa f ...1977864568
effects of hydrocortisone acetate treatment on the small intestine of the lactent marsupial didelphis albiventris.when hydrocortisone acetate was administered subcutaneously to the lactent brazilian white belly opossum, it induced precocious intestinal maturation. histological features of the small intestine were reminiscent of those seen in human protein-caloric malnutrition. there were also indications that the glucocorticoid acted as an inducer of the differentiation of paneth, goblet and granulomucous cells within the small intestinal epithelium. in the lactent opossum the small intestine is lined by an ...19912064018
multilocus enzyme electrophoresis analysis of trypanosoma cruzi isolates from a geographically restricted endemic area for chagas' disease in argentina.a set of 65 trypanosoma cruzi stocks from dogs, opossums, insect vectors and humans was isolated in a geographically restricted endemic area for chagas' disease in argentina and was analysed by multilocus enzyme electrophoresis for 15 loci. the results show that at least five multilocus genotypes (clonets) circulate in the study area, one belonging to t. cruzi iie, one to t. cruzi iid and three clonets belonging to t. cruzi i; and they confirm the presence of these lineages in the country. the t ...200313129520
leishmania spp. in didelphis albiventris and micoureus paraguayanus (didelphimorphia: didelphidae) of brazil.leishmaniasis is kept in nature by the participation of several animal species. this study evaluated the presence of leishmania spp. in skin samples of free-ranging marsupials micoureus paraguayanus (n=95) and didelphis albiventris (n=191), captured in morro do diabo state park and in sections of its surrounding forest, in the region of pontal do paranapanema, são paulo state, brazil. the samples were tested for the presence of kdna of leishmania spp. by polymerase chain reaction (pcr) and by re ...201021144664
morphological study of tetratrichomonas didelphidis isolated from opossum lutreolina crassicaudata by scanning electron microscopy.tetratrichomonas didelphidis is a flagellate protozoan found in the intestine of opossums didelphis marsupialis, didelphis albiventris, and lutreolina crassicaudata. the isolate used in this study was from l. crassicaudata and it was cultivated in monoxenic culture with escherichia coli in diamond (tym) medium without maltose and with starch solution (trypticase-yeast extract-starch), ph 7.5 at 28 degrees c. scanning electron microscopy showed the fine morphological features of the trophozoites: ...200717252276
long-term reduction of trypanosoma cruzi infection in sylvatic mammals following deforestation and sustained vector surveillance in northwestern argentina.long-term variations in the dynamics and intensity of sylvatic transmission of trypanosoma cruzi were investigated around eight rural villages in the semiarid argentine chaco in 2002-2004 and compared to data collected locally in 1984-1991. of 501 wild mammals from 13 identified species examined by xenodiagnosis, only 3 (7.9%) of 38 didelphis albiventris opossums and 1 (1.1%) of 91 conepatus chinga skunks were infected by t. cruzi. the period prevalence in opossums was four-fold lower in 2002-20 ...200616839513
sarcocystis neurona infections in raccoons (procyon lotor): evidence for natural infection with sarcocysts, transmission of infection to opossums (didelphis virginiana), and experimental induction of neurologic disease in raccoons.equine protozoal myeloencephalitis (epm) is a serious neurologic disease of horses in the americas and sarcocystis neurona is the most common etiologic agent. the distribution of s. neurona infections follows the geographical distributions of its definitive hosts, opossums (didelphis virginiana, didelphis albiventris). recently, cats and skunks were reported as experimental and armadillos as natural intermediate hosts of s. neurona. in the present report, raccoons (procyon lotor) were identified ...200111698157
[description of the external morphology of duboisiella proloba baer, 1983 (trematoda: strigeida) from didelphis albiventris in argentina, by scanning electronic microscope].the aim of this study was to report some external morphological features of duboisiella proloba baer, 1938. the parasites were collected during necropsy from the small intestine of didelphis albiventris hunted in its native environment near corrientes city, argentina. collected specimens of duboisiella proloba were observed by light microscopy in order to be classified. later the parasites were put into a 3% glutaraldehyde solution, dehydrated, dried by critical point, assembled, metallized, obs ...200011338969
an outbreak of sarcocystosis in psittacines and a pigeon in a zoological collection in brazil.this report describes an outbreak of acute pulmonary sarcocystosis in different species of captive psittacines and in a luzon bleeding-heart pigeon (gallicolumba luzonica) in a zoological collection in brazil. a majority of the birds were found dead and had exhibited no previous clinical signs. grossly, pulmonary congestion and edema were the most-common findings. enlarged and congested livers and spleens were also frequently observed. microscopically, there was edema, fibrin exudation, congesti ...200819166069
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 ...200717307027
Life-cycle and host preference of Amblyomma ovale (Acari: Ixodidae) under laboratory conditions.This study evaluated for the first time the life cycle of Amblyomma ovale in the laboratory. For this purpose, larvae and nymphs were exposed to Gallus gallus (chickens), Cavia porcellus (guinea pigs), Rattus norvegicus (wistar rats), Oryctolagus cuniculus (domestic rabbits), Calomys callosus (vesper mouse), and Didelphis albiventris (white-eared opossum). Nymphs were also exposed to Nectomys squamipes (South American water rat). Adult ticks were fed on dogs. The life-cycle of A. ovale in labora ...201122113779
[relationships between trypanosoma cruzi transmission cycles in the county of bambuí, minas gerais, brazil].this study examines recent relationships between domestic and sylvatic transmission cycles of t. cruzi in the county of bambuí, mg, brazil. in the late l930s, panstrongylus megistus was found in 75% of houses. subsequently, triatoma infestans became the predominant species, found in 20% of urban households and in more than 60% of periurban homes. with intense insecticide control campaigns between l956 and l969, t. infestans was eradicated from the county, transmission of chagas' disease to man w ...200314676933
occurrence of gastrointestinal protozoa in didelphis albiventris (opossum) in the central region of rio grande do sul state.the aim of this study was to evaluate the parasitism by gastrointestinal protozoa in didelphis albiventris (opossum) in the central region of rio grande do sul state. fecal samples from six free living opossums were collected for research of parasites. samples were analyzed by the centrifugal-flotation method with zinc sulfate and parasites were identified microscopically based on (oo)cyst size and morphology. cysts of giardia sp. and oocysts of cryptosporidium sp. and eimeria sp. were observed ...200818035587
high prevalence of trypanosoma rangeli and trypanosoma cruzi in opossums and triatomids in a formerly-endemic area of chagas disease in southeast brazil.in brazil trypanosoma rangeli has been detected in humans, sylvatic mammals and vectors in the amazon basin and in wild rodents in a southern state. here we report for the first time a high prevalence of t. rangeli in opossums and triatomids captured in peridomestic environments in a formerly-endemic area of chagas disease in southeast brazil. five molecular typing tools clearly indicate the presence of t. rangeli and trypanosoma cruzi in mammalian reservoirs and triatomids. twenty-one opossums ...200212443797
wild and synanthropic hosts of leishmania (viannia) braziliensis in the endemic cutaneous leishmaniasis locality of amaraji, pernambuco state, brazil.evidence of leishmania infection was found in small mammals captured between 1996 and 2000 in the amaraji region, pernambuco state, brazil. the kdna polymerase chain reaction (pcr), using primers specific for subgenus l. (viannia), was positive for 43/153 water rats (nectomys squamipes), 13/81 black rats (rattus rattus), 15/103 grass mice (bolomys lasiurus), 1/14 marsh mice (holochilus scieurus), 2/50 field mice (akodon arviculoides), 2/12 woolly opossums (marmosa sp.), and 5/37 common opossums ...200315228244
histoplasma capsulatum isolated from didelphis albiventris (marsupialia: didelphidae) in the state of minas gerais, brazil.we report the isolation of histoplasma capsulatum from a culture of the viscera of didelphis albiventris, one of the marsupial species found in brazil. to our knowledge, this is the first report of the isolation of this fungus from this mammalian species. this finding confirms the ubiquitous presence of h. capsulatum in nature.200115496125
spatial learning in south american opossums and armadillos.this experiment compares spatial learning in the south american opossum (didelphis albiventris) and armadillo (chaetophractus villosus) in a y-maze. ss learned to turn to one arm of the maze for food reinforcement. to earn further reinforcements, they had to return to the start-box (after consuming the food) where they were restrained for a fixed intertrial interval. the number of entries to the unbaited arm en route to the goal-box (ri errors), and in the way back to the start-box (rf errors) w ...19846470686
fibroblast growth factor 9: cloning and immunolocalisation during tooth development in didelphis albiventris.there are no reports in literature about functional roles of fibroblast growth factor 9 (fgf-9) in tooth development in animals with complete tooth pattern. the classical model for studying tooth development is the mouse, which has small number of teeth and distinctive incisor and molar patterns. the opossum didelphis albiventris with five upper and four lower incisors, one canine, three premolars, and four molars, on each side of the jaw, seems to be a convenient model to test results obtained ...200616188224
probability of trypanosoma cruzi transmission by triatoma infestans (hemiptera: reduviidae) to the opossum didelphis albiventris (marsupialia: didelphidae).the probability of trypanosoma cruzi transmission to opossums by independent events of predation and fecal contamination during feeding ("biting") with positive triatoma infestans was estimated. negative female opossums were challenged for 23 hr with 10 infected third and fourth instars of t. infestans, and tests for positivity for t. cruzi by xenodiagnosis were performed at 30, 60, and 90 days. from these data, seven probability parameters were estimated by maximum likelihood, and likelihood ra ...200111508386
a new species of mathevotaenia (cestoda: anoplocephalidae) and other tapeworms from marsupials in argentina.cestodes are reported from didelphis albiventris lund, 1840 and micoureus cinereus temminck, 1824 (marsupialia: didelphidae) in argentina. these include a new species of mathevotaenia akhumyan, 1946 (cestoda: anoplocephalata) as well as m. bivittata (janicki, 1904) and an unknown hymenolepidid cestode. mathevotaenia argentinensis n. sp. is characterized by a relatively narrow strobila, 18-37 mm in total length and 1.0-1.5 mm in maximum width, 135-163 craspedote proglottids, 19-27 testes, and a m ...200314740908
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 ...201425410992
susceptibility of different triatomine species to trypanosoma rangeli experimental infection.trypanosoma rangeli is a kinetoplastid protozoan parasite that has been found in the majority of latin american countries, overlapping its distribution area with that of trypanosoma cruzi, the causative agent of chagas disease. this parasite shares the same reservoirs and vectors as t. cruzi. triatomines from genus rhodnius are considered the most susceptible hosts to infection. in this work, we report the susceptibility of different triatomine species (rhodnius neglectus, panstrongylus megistus ...200616584327
prevalence of antibodies against toxoplasma gondii among brazilian white-eared opossums (didelphis albiventris).considering that toxoplasma gondii is a parasite of global importance which affects several animal species including humans, the current study aimed to investigate the prevalence of antibodies against t. gondii among 72 white-eared opossums (didelphis albiventris) from botucatu municipality (22-¦53's 48-¦26'w), s+úo paulo state, brazil. the investigation was carried out from january 2008 to december 2009, when the animals had their blood samples collected and subjected to the modified agglutinat ...201121435790
structure of parasite component communities of didelphid marsupials: insights from a comparative study.abstract the parasite fauna of the gray four eyed opossum and the common opossum in camp du tigre, french guiana is herein characterized. nine species from the gastrointestinal system were recovered from both species, which shared 80% of their parasites. the parasite fauna comprised several monoxenous species (63%) and was dominated by a. raillieti, which exhibited high levels of prevalence and abundance in both communities. only 2 species (moennigia sp. and spirura guianensis) had been recorded ...201121506798
isolation and characterization of a serine protease, ba iii-4, from peruvian bothrops atrox venom.a serine protease from bothrops atrox (peruvian specimen's venom) was isolated in two chromatographic steps in lc molecular exclusion and reverse phase-hplc. this protein was denominated ba iii-4 (33,080.265 da determinated by maldi-tof mass spectrometry) and showed pi of 5.06, km 0.2 x 10(-1 ) m and the v (máx) 4.1 x 10(-1 )nmoles p-na/lt/min on the synthetic substrate bapna. ba iii-4 also showed ability to coagulate bovine fibrinogen. the serine protease was inhibited by soyben trypsin inhibit ...200717522968
domiciliation of triatoma pseudomaculata (corrêa e espínola 1964) in the jequitinhonha valley, state of minas gerais.impact of the vector control program was evaluated eight years after implantation of epidemiological surveillance for chagas disease in berilo, a municipality in the jequitinhonha valley of the brazilian state of minas gerais. in all 5,242 domiciliary units (96% of the total) were inspected and 10 found to be infested by the triatomine bug triatoma pseudomaculata. triatomines were found associated with bats inside one house and in the peridomiciles of the other nine. none of the 111 triatoma pse ...200717876457
characterization of trypanosoma cruzi isolated from humans, vectors, and animal reservoirs following an outbreak of acute human chagas disease in santa catarina state, brazil.during march 2005, 24 cases of acute human chagas disease were detected in santa catarina state, southern brazil, all of them related to the ingestion of trypanosoma cruzi-contaminated sugar cane juice. following field studies allowed the isolation of 13 t. cruzi strains from humans, opossums (didelphis aurita and didelphis albiventris), and vectors (triatoma tibiamaculata). the isolated strains were characterized by multilocus enzyme electrophoresis (mlee) and analysis of the spliced-leader and ...200817889480
[mycobacterium bovis in wildlife of the dairy regions of santa fe (argentina)].control eradication campaigns of bovine tuberculosis based on the «test and slaughter» approach were successful in many countries and regions; however, in some areas the infection persists and one of the main reasons is mycobacterium bovis infection in wild life species. argentina has applied the same approach since 1999, achieving progress in dairy cattle herds. nonetheless, the wildlife role has never been investigated. the objective of this study was to determine if wildlife from the santa fe ...201526376835
karyotype composition of some rodents and marsupials from chapada diamantina (bahia, brasil).the chapada diamantina (cd) is located in bahia state, between 11-14 degrees s and 41-43 degrees w, being part of the serra do espinhaço. the occurrence of different habitats and transition areas permits an interesting mammal fauna composition, with species from different biomes living in sympatry. species of didelphimorphia and rodentia are important members of mammal communities in almost all different habitats, and morphological and cytogenetic characters are important for a correct identific ...200718094834
habitat associations of small mammals in southern brazil and use of regurgitated pellets of birds of prey for inventorying a local fauna.we inventoried terrestrial small mammals in an agricultural area in southern brazil by using trapping and prey consumed by barn owls (tyto alba) and white-tailed kites (elanus leucurus). small mammals were trapped in three habitat types: corn fields, uncultivated fields ("capoeiras"), and native forest fragments. a total of 1,975 small mammal specimens were trapped, another 2,062 identified from the diet of barn owls, and 2,066 from the diet of white-tailed kites. both trapping and prey in the p ...200718278312
[occurrence of ixodes loricatus neumann, 1899 (acari: ixodidae) parasitizing didelphis albiventris (lund, 1841) (didelphimorphia: didelphidae) in campo grande, ms].this is first report of occurence of ixodes in the state of mato grosso do sul and first description of ixodes loricatus neumann, 1899, parasitizing didelphis albiventris in campo grande, ms, brazil.200819245763
epidemiological factors related to the transmission risk of trypanosoma cruzi in a quilombola community, state of mato grosso do sul, brazil.this work was an epidemiological investigation of the risk of trypanosoma cruzi transmission in the rural quilombola community of furnas do dionízio, state of mato grosso do sul, brazil.201122031072
role of bmp-4 during tooth development in a model with complete dentition.there are no reports in literature about roles of bone morphogenetic protein 4 (bmp-4) in tooth development in mammals with complete dentition (with all dental groups). the classical model of study is the mouse, which has distinctive incisor and molar patterns. the opossum didelphis albiventris with five upper and four lower incisors, one canine, three premolars and four molars, on each side of the jaw, seems to be a convenient model for odontogenesis study. this investigation searched for simil ...200817803954
genome survey sequence analysis and identification of homologs of major surface protease (gp63) genes in trypanosoma rangeli.in this study, 222 genome survey sequences were generated for trypanosoma rangeli strain p07 isolated from an opossum (didelphis albiventris) in minas gerais state, brazil. t. rangeli sequences were compared by blastx (basic local alignment search tool x) analysis with the assembled contigs of leishmania braziliensis, leishmania infantum, leishmania major, trypanosoma brucei, and trypanosoma cruzi. results revealed that 82% (182/222) of the sequences were associated with predicted proteins descr ...201020420528
sandflies (diptera: psychodidae) associated with opossum nests at urban sites in southeastern brazil: a risk factor for urban and periurban zoonotic leishmania transmission?sandflies associated with opossum nests are reported for the first time in the yards of residences located in the urban area of the municipality of monte mor, situated in the metropolitan region of campinas, state of são paulo, brazil. eleven specimens of evandromyia cortelezzii and one of evandromyia lenti were captured in two didelphis albiventris nests. ev. cortelezzii is considered a secondary vector species for the transmission of leishmania (viannia) braziliensis and leishmania (leishmania ...024789554
biochemical, pharmacological, and structural characterization of new basic pla2 bbil-tx from bothriopsis bilineata snake venom.bbil-tx, a pla2, was purified from bothriopsis bilineata snake venom after only one chromatographic step using rp-hplc on μ-bondapak c-18 column. a molecular mass of 14243.8 da was confirmed by q-tof ultima api esi/ms (tof ms mode) mass spectrometry. the partial protein sequence obtained was then submitted to blastp, with the search restricted to pla2 from snakes and shows high identity values when compared to other pla2s. pla2 activity was presented in the presence of a synthetic substrate and ...201223509754
hosts, distribution and genetic divergence (16s rdna) of amblyomma dubitatum (acari: ixodidae).we supply information about hosts and distribution of amblyomma dubitatum. in addition, we carry out an analysis of genetic divergence among specimens of a. dubitatum from different localities and with respect to other neotropical amblyomma species, using sequences of 16s rdna gene. although specimens of a. dubitatum were collected on several mammal species as cattle horse, tapirus terrestris, mazama gouazoubira, tayassu pecari, sus scrofa, cerdocyon thous, myocastor coypus, allouata caraya, glo ...201020084537
immunocytochemical demonstration of insulin in the mesonephros and metanephros of the brazilian opossum didelphis albiventris).the presence of insulin the brush border and apical pole of the cells lining the pouch opossum mesonephric and metanephric proximal tubules was demonstrated by immunofluorescence and immunoperoxidase techniques. positive result for insulin was also observed in the tufts of capillaries of some metanephric corpuscles.20143913345
staphylococcus aureus mastitis in a white-eared opossum (didelphis albiventris) in the atlantic forest of northeast brazil.this is the first brief communication of clinical mastitis caused by staphylococcus aureus occurring in a white-eared opossum (didelphis albiventris) captured in a remnant of the atlantic forest in northeast brazil. the bacterium was cultured from a milk sample by using sheep blood and levine agars. phenotyping of s aureus was performed with coagulase biochemical tests, dnase agar, mannitol agar, and anaerobic glucose and mannitol fermentation.201020945655
trichinella infection in wild animals from endemic regions of argentina.natural infection with trichinella has been described in more than 150 mammalian species. however, few reports of trichinella infection in wild animals have come from argentina. in this study, muscle tissue was obtained from wild animals in argentina with the aim of evaluating the presence of trichinella. a total of 169 muscle samples were collected to determine the presence of trichinella larvae by artificial digestion. the 169 muscle samples originated from 12 species including 36 opossums (di ...201020424859
trypanosoma cruzi infection in wild mammals of the national park 'serra da capivara' and its surroundings (piaui, brazil), an area endemic for chagas disease.we studied the prevalence of trypanosoma cruzi infection among eight species of wild small mammals (n=289) in an area where human cases of infection/disease have occurred. dogs (n=52) and goats (n=56) were also surveyed. the study was carried out inside a biological reserve, the national park 'serra da capivara' and its surroundings in piaui state, brazil. the marsupial didelphis albiventris and the caviomorph rodent trichomys apereoides were found to be the most important reservoirs in the stud ...200515780345
rickettsial infection in animals, humans and ticks in paulicéia, brazil.a previous study in paulicéia municipality, south-eastern brazil, reported 9.7% of the amblyomma triste ticks to be infected by rickettsia parkeri, a bacterial pathogen that causes spotted fever in humans. these a. triste ticks were shown to be associated with marsh areas, where the marsh deer blastocerus dichotomus is a primary host for this tick species. during 2008-2009, blood serum samples were collected from 140 horses, 41 dogs, 5 opossums (didelphis albiventris) and 26 humans in farms from ...201525643912
search for mycobacterium leprae in wild mammals.leprosy is still a worldwide public health problem. brazil and india show the highest prevalence rates of the disease. natural infection of armadillos dasypus novemcinctus with mycobacterium leprae has been reported in some regions of the united states. identification of bacilli is difficult, particularly due to its inability to grow in vitro. the use of molecular tools represents a fast and sensitive alternative method for diagnosis of mycobacteriosis. in the present study, the diagnostic metho ...201020428654
leishmania chagasi in opossums (didelphis albiventris) in an urban area endemic for visceral leishmaniasis, campo grande, mato grosso do sul, brazil.we investigated the occurrence of leishmania infantum chagasi in didelphis albiventris opossums at a wild animal rehabilitation center in the city of campo grande, brazil. a total of 54 opossums were tested for l. i. chagasi infection in peripheral blood and bone marrow samples. the samples were analyzed by direct examination, culturing in a specific medium, and polymerase chain reaction-restriction fragment length polymorphism. leishmania i. chagasi dna was detected by polymerase chain reaction ...201222802435
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 ...201425165976
Investigation of Chagas disease in four periurban areas in northeastern Brazil: epidemiologic survey in man, vectors, non-human hosts and reservoirs.Chagas disease was investigated in four periurban areas of Ceará state, northeastern Brazil, through serological, parasitological and molecular methods in humans, reservoirs and vectors. A cross-sectional survey revealed a seroprevalence rate of 1.2% (13/1076 residents, six also proving positive through PCR). Trypanosoma cruzi infection was not detected in children under 10 years old. Triatoma pseudomaculata prevailed in the peridomiciles: 63 specimens, 69% (34/49) infected with trypanosomatids. ...201122136953
trypanosoma rangeli: rapd-pcr and lssp-pcr analyses of isolates from southeast brazil and colombia and their relation with kpi minicircles.this study presents the first genetic characterization of five trypanosoma rangeli isolates from minas gerais, in the southeast of brazil and their comparison with colombian populations by minicircle classification, rapd-pcr and lssp-pcr analyses. our results demonstrated a homogenous t. rangeli population circulating among didelphis albiventris as reservoir host in brazil while heterogeneous populations were found in different regions of colombia. kp1(+) minicircles were found in 100% isolates ...200717517390
leptospira borgpetersenii from free-living white-eared opossum (didelphis albiventris): first isolation in brazil.leptospirosis is a zoonotic disease that occurs all over the world, caused by bacteria of the genus leptospira. marsupial and didelphidae families are considered susceptible to infection caused by a wide range of leptospira serovars for which they serve as reservoirs. thirty-three free-living white-eared opossums (didelphis albiventris) were captured in southern brazil and bodily fluids were collected. from the urine samples it was possible to obtain an isolate identified as leptospira borgpeter ...201222897870
genotyping of toxoplasma gondii and sarcocystis spp. in road-killed wild mammals from the central western region of the state of são paulo, brazil.road-killed wild animals host zoonotic pathogens such as toxoplasma gondii, offering a new opportunity for the epidemiological study of these infectious organisms.201627812655
first isolation of leptospira interrogans from lycalopex griseus (south american gray fox) in argentina shows new mlva genotype.to identify carriers of leptospira spp. in argentina, wild animals were trapped in buenos aires province during three nights, capturing 12 didelphis albiventris (white-eared opossum), six chaetophractus villosus (big hairy armadillo), five lycalopex griseus (south american gray fox), and two conepatus chinga (molina's hog-nosed skunk). all were tested by microscopic agglutination test, and five (two gray foxes, two armadillos, and one skunk) were positive for leptospira interrogans serovars cani ...201323307384
toxoplasma gondii in domestic and wild animals from forest fragments of the municipality of natal, northeastern brazil.toxoplasmosis stands out as a global disease that has felines as definitive hosts. in the municipality of natal, rio grande do norte state, brazil, two parks are notable for their ecological and social importance. this study aimed to investigate the presence of toxoplasma gondii in short hair cats, bats and small non-volant mammals in these two ecological reserves. altogether, biological samples were obtained from 154 mammals, 92 wild animals from both areas and 62 domestic cats of the parque da ...201725517529
mitochondrial genetic variability of didelphis albiventris (didelphimorphia, didelphidae) in brazilian localities.didelphis albiventris is a well-known and common marsupial. due to its high adaptability, this very widespread generalist species occurs under various environmental conditions, this even including protected regions and disturbed urban areas. we studied a 653 bp fragment of cytochrome oxidase c (coi) from 93 biological samples from seven brazilian localities, with linear distances ranging between 58 and about 1800 km to analyze the effects of geographic distances on variability and genetic differ ...201222888303
molecular characterization of an opossum didelphis albiventris (marsupialia: didelphidae) population in an urban fragment of the brazilian atlantic rainforest and support to species barcode identification.we made a molecular study of 40 opossums, didelphis albiventris, from an urban fragment of the atlantic rainforest in southeastern brazil, analyzing a 653-bp sequence of cytochrome c oxidase, subunit i. we found three close connected haplotypes, with low nucleotide diversity and a haplotype diversity of 59.1% and confirmed sympatry between d. albiventris and d. aurita in this region. the clear phylogenetic separation shows the appropriateness of dna barcode identification methodology for effecti ...201222782626
which factors determine spatial segregation in the south american opossums (didelphis aurita and d. albiventris)? an ecological niche modelling and geometric morphometrics approach.didelphis albiventris and d. aurita are neotropical marsupials that share a unique evolutionary history and both are largely distributed throughout south america, being primarily allopatric throughout their ranges. in the araucaria moist forest of southern brazil these species are sympatric and they might potentially compete having similar ecology. for this reason, they are ideal biological models to address questions about ecological character displacement and how closely related species might ...201627336371
molecular identification of trypanosomatids in wild animals.diverse wild animal species can be reservoirs of zoonotic flagellate parasites, which can cause pathologic chagas disease. the present study aimed to detect the natural occurrence of flagellate parasites through direct microscopic examination of the parasites in blood samples and through pcr of whole blood and blood culture (haemoculture) samples from 38 captive and 65 free-living wild animals in the centre for conservation of wild fauna (ccwf), an area endemic for leishmaniasis. for this study, ...201424636787
the araguaia river as an important biogeographical divide for didelphid marsupials in central brazil.the riverine barrier model suggests that rivers play a significant role in separating widespread organisms into isolated populations. in this study, we used a comparative approach to investigate the phylogeography of 6 didelphid marsupial species in central brazil. specifically, we evaluate the role of the mid-araguaia river in differentiating populations and estimate divergence time among lineages to assess the timing of differentiation of these species, using mitochondrial dna sequence data. t ...201526249652
dental development of didelphis albiventris (marsupialia): i--incisors and canines.the formation of incisors and canines in marsupials of d. albiventris was studied at various stages of development. seventy-six specimens, with ages varying from 0 to 100 days, were used in this investigation. serial sections of the maxilla were obtained in the transverse plane and stained with hematoxylin and eosin. histological analyses were made to verify the pattern of teeth development, as well as their chronology of eruption. the period of time from birth to 100 days comprised the entire p ...200616680306
marsupials from space: fluctuating asymmetry, geographical information systems and animal conservation.we report the development of a new quantitative method of assessing the effects of anthropogenic impacts on living beings; this method allows us to assess actual impacts and to travel backwards in time to assess impacts. in this method, we have crossed data on fluctuating asymmetry (fa, a measure of environmental or genetic stress), using didelphis albiventris as a model, with geographical information systems data relating to environmental composition. our results show that more impacted environ ...200616627287
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