| [human populations attacked by wild triatominae in the amazonas: a new form of transmission of chagas disease?]. | an "attack" of wild triatomines (rhodnius brethesi) to piaçaca workers (leopoldinia piaçaba) is confirmed in the locality of acuquaia, at padauari river, affluent of rio negro in the municipality of barcelos, state of amazonas, brazil. a serological prevalence of 12.5% for t. cruzi antibodies in human population, in the city of barcelos, has already been described in a previous paper. a strong association between the serological positivity and the population contact with wild triatomines, known ... | 1994 | 7855369 |
| phylogeny and molecular taxonomy of the rhodniini derived from mitochondrial and nuclear dna sequences. | eleven species of rhodnius and one of psammolestes were compared by dna sequence analysis of fragments of the mitochondrial large subunit ribosomal rna (mtlsurrna), the mitochondrial cytochrome b (mtcytb), and the d2 variable region of the 28s nuclear rna (d2), totaling 1,429 base pairs. the inferred phylogeny, using triatoma infestans as an outgroup, revealed two main clades within the rhodniini--one, including the prolixus group of species (rhodnius prolixus, rhodnius robustus, rhodnius neglec ... | 2000 | 11220761 |
| two main clusters within trypanosoma cruzi zymodeme 3 are defined by distinct regions of the ribosomal rna cistron. | trypanosoma cruzi is currently classified into 2 major phylogenetic lineages, t. cruzi i and ii, that correlate with the formerly described zymodeme 1 and 2, respectively. another isoenzymic group (zymodeme 3-z3) was also described. in this study, we analysed the genetic diversity among z3 isolates of the brazilian amazon by restriction fragment length polymorphism of the intergenic transcribed spacers (itss) of the ribosomal rna cistron and the size of the divergent domain d7 of the 24salpha rr ... | 2002 | 11862994 |
| allozyme relationships among ten species of rhodniini, showing paraphyly of rhodnius including psammolestes. | genetic relationships among 10 species of bugs belonging to the tribe rhodniini (hemiptera: reduviidae), including some important vectors of chagas disease, were inferred from allozyme analysis of 12 enzyme loci (out of 21 enzyme systems examined), using agarose gel electrophoresis. these species formed two clusters: one comprising rhodnius brethesi, r. ecuadoriensis, r. pallescens and r. pictipes; the other with psammolestes tertius, rhodnius domesticus and the rhodnius prolixus group comprisin ... | 2002 | 11963985 |
| [life cycle of rhodnius brethesi matta, 1919 (hemiptera, reduviidae, triatominae), a potential vector of chagas disease in the amazon region]. | r. brethesi is a sylvatic species from the amazon region; it has been incriminated as responsible for the transmission of chagas disease in collectors of piacaba in this region. the aim of present study was to investigate the efficiency of these insects as potential vectors of trypanosoma cruzi. aspects related with feeding and defecation patterns, life time, and mortality had been observed in each instar of r. brethesi. we use 5th instar nymphs to get adults virgins, after the moulting 3 groups ... | 2004 | 15558169 |
| morphobiological aspects of rhodnius brethesi matta, 1919 (hemiptera:reduviidae) from the upper and middle negro river, amazon region of brazil: i - scanning electron microscopy. | the occurrence of autochthonous cases of chagas disease in the amazon region of brazil over recent decades has motivated an intensification of studies in this area. different species of triatomines have been identified, and ten of these have be proven to be carriers of the parasite trypanosoma cruzi or " cruzi-like " parasites. studies conducted in the municipalities of santa isabel do rio negro and barcelos, located on the upper and middle of the negro river, microregion of negro river, state o ... | 2006 | 16444425 |
| 2-de-based proteomic investigation of the saliva of the amazonian triatomine vectors of chagas disease: rhodnius brethesi and rhodnius robustus. | the triatomine bugs are obligatory haematophagous organisms that act as vectors of chagas disease by transmitting the protozoan trypanosoma cruzi. their feeding success is strongly related to salivary proteins that allow these insects to access blood by counteracting host haemostatic mechanisms. proteomic studies were performed on saliva from the amazonian triatomine bugs: rhodnius brethesi and r. robustus, species epidemiologically relevant in the transmission of t. cruzi. initially, salivary p ... | 2011 | 21362504 |
| diversity of anti-haemostatic proteins in the salivary glands of rhodnius species transmitters of chagas disease in the greater amazon. | the triatomines in the tribe rhodniini are the main vectors of the trypanosoma cruzi to humans in recent outbreaks of acute chagas disease in the amazon. these insects dwelling in palm trees do not colonize the human domicile. their success to transmit the infection relies partially on the efficacy of their salivary gland apparatuses. here we show the transcriptome of the rhodnius brethesi and rhodnius robustus salivary glands, comprising 56 and 122 clusters, respectively. approximately one thir ... | 2011 | 21742069 |
| ecological diversity of trypanosoma cruzi transmission in the amazon basin. the main scenaries in the brazilian amazon. | the ecological diversity of trypanosoma cruzi transmission in the brazilian amazon region is directly interlinked with the parasite's extensive reservoir, composed of 33 species of wild mammals within the following orders: marsupialia, chiroptera, rodentia, xenarthra, carnivora and primates; and of 16 species of wild triatomines, of which ten may be infected with t. cruzi. four scenarios for the diversity of t. cruzi transmission in the brazilian amazon region are evident: (i) t. cruzi transmiss ... | 2015 | 26254002 |
| phenotypic variability of the amazonian species rhodnius brethesi (hemiptera: reduviidae). | the wild species rhodnius brethesi (matta, 1919) (hemiptera: reduviidae) is found in areas of piassabais in microregion of rio negro, amazonas, brazil. its geographical distribution overlaps the areas of leopoldinia piassaba palm. in areas where palm trees are found, transmission cycle of trypanosoma cruzi is related to the extractive activity of the palm fiber, exposing workers to wild vector transmission of this parasite. the close association with the palm tree l. piassaba suggests that this ... | 2017 | 28449112 |