Avaliação da diversidade de insetos hematófagos da subordem Nematocera e de vertebrados silvestres: transmissão de arbovírus na área de influência do Projeto Salobo, Carajás, Pará

Abstract

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.