characterization and classification of leishmanial parasites from humans, wild mammals, and sand flies in the amazon region of brazil.ninety-four leishmanial isolates from the brazilian amazon region (amapá, amazonas, pará, and rondônia) were identified and classified using specific monoclonal antibodies and an indirect radioimmunoassay (serodeme analysis); eighty-two were also characterized by enzyme electrophoresis (zymodeme analysis), the results of which were subjected to a numerical phenetic analysis. six isolates from humans (3), didelphis marsupialis (1), lutzomyia olmeca nociva (1), and lu, reducta (1) showed reactivit ...19911858968
[presence of antibodies for hepatitis a virus in didelphis marsupialis (vertebrata. marsupialia) of the amazon region]. 19872827292
rotavirus infection in wild marsupials (didelphis marsupialis) of the amazon region.rotavirus was detected by enzyme-linked immunosorbent assay in faecal specimens collected from two (1.35%) of 148 marsupials trapped in the amazon jungle environment. the positive samples were both from the "common opossum", didelphis marsupialis. no infections were found in the stools of 198 animals belonging to other mammalian species: the latter included small rodents, chiropterans and primates. electron microscopic examination of one (ma 5928) rotavirus-positive specimen showed a large numbe ...19863014690
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
distribution of histoplasma capsulatum in amazonian a survey of 296 sylvatic animals captured from virgin forests in the north-eastern and south-western amazon of brazil, histoplasma capsulatum was isolated, via the indirect hamster inoculation method, from the liver and spleen of four common opossums didelphis marsupialis and two pacas agouti paca. the infected animals did not show any clinical symptoms or histopathology. the known amazonian mammalian species with natural histoplasmosis now total five, the previously reported species being th ...19853990770
[besnoitia (protozoa: toxoplasmatinae) isolated from opossums didelphis marsupilis in the amazon region, brazil].from a total of 224 didelphis marsupialis examined, in 15 were found cysts of besnoitia in muscles and viscera. it's the first time that this protozoan is isolated from naturally infected animals in brazil. the experimental transmission to laboratory animals was done by the inoculum of tissue and cysts triturated.19836400169
vertebrate hosts and vectors of trypanosoma rangeli in the amazon basin of brazil.a total of 46 trypanosoma rangeli stocks were isolated from naturally infected mammals and triatomine vectors. twenty-two stocks were from the common opossum (didelphis marsupialis), one from the brown "4-eyed" opossum (metachirus nudicaudatus), one from the anteater (tamandua tetradactyla), one from the coati (nasua nasua), seven from rhodnius pictipes and 14 from rhodnius robustus. two stocks were also isolated from recently fed sandflies (lutzomyia sp., shannoni group). the stocks were identi ...19836418015
chagas' disease in the amazon basin iv. host records of trypanosoma cruzi zymodemes in the states of amazonas and rondonia, brazil.of 151 trypanosoma cruzi stocks from 117 different individual hosts collected in the states of amazonas and rondonia, 147 from 113 hosts were identified as zymodeme 1 (z1). these included t. cruzi stocks from three marsupial species, two rodent species and three triatomine species although most were from the common opossum, didelphis marsupialis. one t. cruzi stock from rhodnius robustus was identified as z1 with a z3 pgm character, one from sciurus sp. as z3 and two from monodelphis brevicaudat ...19846441530
chagas' disease in the amazon basin: v. periurban palms as habitats of rhodnius robustus and rhodnius pictipes--triatomine vectors of chagas' disease.trypanosoma cruzi infected rhodnius robustus and/or rhodnius pictipes were commonly found, in large numbers, in the brazilian amazonian palms maximiliana regia ("inajá"), acrocomia sclerocarpa ("mucajá") and orbignya speciosa ("babaçu"). the common opossum, didelphis marsupialis, was the animal most frequently associated with triatomine infested palms. r. pictipes, frequently light-attracted into houses from palm trees, was the probable source of an acute case of chagas' disease in the vicinity ...19836443629
chagas's disease in the amazon basin: ii. the distribution of trypanosoma cruzi zymodemes 1 and 3 in pará state, north pará state, brazil, 123 trypanosoma cruzi stocks were isolated from 12 silvatic mammal species, five silvatic triatomine species and individuals with acute chagas's disease. 100 t. cruzi stocks were identified as zymodeme (z) 1, 17 as z3 and 6 as z3 with z1 asat character, but none were t. cruzi z2. z1 was predominantly isolated from arboreal mammals, especially didelphis marsupialis; z3 was mainly found in terrestrial or burrowing mammals, particularly dasypus novemcinctus and monodelphis br ...19817036428
the opossum, didelphis marsupialis (marsupialia: didelphidae), as a reservoir host of leishmania braziliensis guyanensis in the amazon basin of brazil.a total of 52 opossums (six species) were examined for evidence of infection with leishmania in three different areas of forest near manaus, amazonas state, brazil. no infections were detected in 27 opossums from a region of relatively undisturbed forest, including specimens of didelphis marsupialis (18); metachirus nudicaudatus (four); monodelphis brevicaudata (one); marmosa cinerea (two); m. murina (one) and m. parvidens (one). of 15 d. marsupialis captured from a biological reserve, much dist ...19817324129
new records of histoplasma capsulatum from wild animals in the brazilian amazon.twenty-eight isolates of histoplasma capsulatum were obtained from eight species of forest mammals from the states of amazonas, pará and rondônia in the amazon region of brazil. primary isolates were obtained by inoculating triturated liver and spleen tissue intradermally and intraperitoneally in hamsters. mycological diagnosis in hamsters presenting lesions was confirmed by histopathology and culture on sabouraud dextrose-agar. infected hamsters developed signs of disease within two to nine mon ...19969216108
emerging chagas disease: trophic network and cycle of transmission of trypanosoma cruzi from palm trees in the amazon.a trophic network involving molds, invertebrates, and vertebrates, ancestrally adapted to the palm tree (attalaea phalerata) microhabitat, maintains enzootic trypanosoma cruzi infections in the amazonian county paço do lumiar, state of maranhão, brazil. we assessed seropositivity for t. cruzi infections in the human population of the county, searched in palm trees for the triatomines that harbor these infections, and gathered demographic, environmental, and socioeconomic data. rhodnius pictipes ...200111266300
notes on parasitism by amblyomma humerale (acari: ixodidae) in the state of rondônia, western amazon, brazil.the tick amblyomma humerale koch is endemic to south america. all host records refer to the adult stage parasitizing tortoises, mostly yellow-footed tortoise, geochelone denticulata (l.), and red-footed tortoise, geochelone carbonaria (spix). the current study reports the presence of a. humerale in the state of rondônia, brazil. a total of 215 adult ticks (201 males, 14 females) was collected from six g denticulata in an indian reserve and nine geochelone sp. in rural monte negro county, giving ...200212495177
non-legalized commerce in game meat in the brazilian amazon: a case tropical forests, wild game meat represents an option or the only protein source for some human populations. this study analyzed the wildlife meat trade destined to human consumption in an open market of the amazon rainforest, brazil. wildlife meat trade was monitored during 2005 through interviews to vendors and consumers in order to evaluate the socioeconomic profile of the sellers, the main species and byproducts sold, their geographical origin, commercial value, frequency of sale and prod ...201020737856
trypanosoma (megatrypanum) lainsoni n. sp. from mesomys hispidus (rodentia: echimyidae) in brazil: trypomastigotes described from experimentally infected laboratory mice.we report the detection, isolation and description of trypanosoma (megatrypanum) lainsoni n. sp. from a caviomorph rodent, mesomys hispidus (rodentia: echimyidae), obtained in the rio negro region of the state of amazonas, in northern brazil. laboratory-bred white mice (mus musculus) and rats (rattus rattus) were inoculated with large numbers of culture forms by intraperitoneal route, and trypomastigotes appeared in their blood 3-8 days post-inoculation. one single epimastigote was also found in ...201324309069
biological behaviour in mice of trypanosoma cruzi isolates from amazonas and paraná, brazil.the biological behaviour of 23 trypanosoma cruzi isolates in swiss mice was compared. nineteen isolates were obtained from patients in the acute phase of chagas disease (13), sylvatic reservoir hosts (didelphis marsupialis) (3), and triatomine bugs (rhodnius robustus) (3) from four regions of the state of amazonas (am). four isolates were obtained from chronic chagasic patients in the state of paraná (pr): three autochthones, and one allochthone from the state of minas gerais. only one isolate w ...201222406038
common opossum (didelphis marsupialis linnaeus, 1758): food and medicine for people in the the amazon rainforest, biodiversity is a significant resource for traditional communities, as it can be used as a relevant source of protein and it has a promising zootherapeutic potential. studies on knowledge and ways how local peoples use the fauna are still incipient. this paper presents both the knowledge on and food and medicinal uses of common opossum (didelphis marsupialis) by riverine communities in an amazon floodplain region.201425209094
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