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Previous issue date: 2009 === IEC - Instituto Evandro Chagas === Salobo Metais === CVRD - Companhia Vale do Rio Doce === Com o objetivo de avaliar a diversidade de insetos hematófagos e de vertebrados silvestres, bem como, a fauna de arbovírus circulante antes das
ações de exploração mineral na jazida polimetálica do Salobo, Província
Mineral de Carajás, Pará, Brasil, no período de dezembro de 2005 a junho de
2007, um estudo longitudinal foi realizado (sete viagens) sendo capturados e
identificados insetos hematófagos (famílias Ceratopogonidae, Culicidae,
Psychodidae e Simulidae) capturados em armadilhas luminosas CDC e
Shannon, e atração humana; e também foram capturados e identificados
vertebrados silvestres das classes das aves (redes de nylon), dos mamíferos e
dos répteis (armadilhas Shermann e Tommahwak); foi feita pesquisa e
determinação da prevalência de anticorpos nos soros e/ou plasmas desses
vertebrados contra arbovírus e tentativas de isolamento viral. Foram
capturados 44.795 (1.220 lotes) insetos hematófagos, sendo a família
Psychodidae a mais prevalente. As espécies mais abundantes de culicídeos
foram Haemagogus leucocelaenus e Haemagogus janthinomys. Foram
também capturados 1.288 vertebrados silvestres, e os roedores Proechimys
guyannensis e Oryzomys capito, e as aves Turdus albicollis e Phlegopsis
nigromaculata foram as espécies mais prevalentes. Foram isoladas em
camundongos recém-nascidos, três cepas do Virus Tucunduba, obtidas a partir
de lotes de Anopheles (Nys.) species, Culex coronator e Wyeomyia species;
foram detectados anticorpos para os seguintes arbovírus: encefalite Saint
Louis (VSLE), Ilhéus, encefalite eqüina Oeste, Cacipacoré, Icoaraci, Rocio,
Bussuquara e Mucambo, sendo a maior prevalência de anticorpos obtida para
o VSLE. === Aiming to evaluate the diversity of hematophagous insects and sylvan
vertebrates, as well as the arbovirus fauna present in the area, a longitudinal
study was performed in the Salobo Project area, Mineral Province of Carajas,
Pará state, Brazil, between December 2005 and June 2007 (seven scientific
expeditions), before the action of mineral extraction be launched. Insects
belonging to the families Ceratopogonidae, Culicidae, Psychodidae, and
Simulidae were collected using the miniature CDC and Shannon light traps, and
human bait; sylvan vertebrates (birds, small mammals and reptilians) were also
captured in the are using Shermann and Tommahwak traps. Biological
specimens from insects and vertebrates were used to attempt of virus isolation
in suckling mice, while the vertebrate serum samples to determine the antibody
prevalence to 19 arboviruses by hemagglutination inhibition (HI) tests. A total of
44,795 (1,220 lots) hematophagous insects were collected, mostly of
Psychodidae. The most abundant species of Culicidae were Haemagogus
leucocelaenus and Haemgogus janthinomys; a total of 1,288 vertebrates were
also captured; the rodents Proechimys guyannensis and Oryzomys capito, and
the birds Turdus albicolis and Phlegopsis nigromaculata were the most
prevalent species in the area. Three Tucunduba virus strains were isolated from
lots of Anopheles (Nys.) sp., Culex coronator and Wyeomyia sp. HI antibodies
were found to Bussuquara virus, Cacipacore virus, Icoaraci virus, Ilheus virus,
Mucambo virus Rocio virus, Saint Louis encephalitis virus (SLEV), and western
equine encephalitis virus. The most prevalent arbovirus by HI was the SLEV.
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