No abstract

Foi realizado um levantamento da Família Gerridae na Bacia Hidrográfica do rio Trombetas, Pará, Brasil, desde as cabeceiras até o Baixo Trombetas. Entre os Hemiptera aquático, Gerridae foi a Família mais representativa, sendo Gerrinae a subfamília mais coletada em 12 dos 35 pontos de coleta. Mapas com os primeiros registros da distribuição geográfica de Gerrinae para a Bacia do rio Trombetas e uma chave para a identificação dos cinco gêneros e seis espécies são apresentadas.

The canine filarial parasite Dirofilaria immitis has not been reported in Brazil´s Amazonas state capital, Manaus, for over a century. Here, we report one imported and 27 autochthonous D. immitis infections from a microfilarial survey of 766 domestic dog blood samples collected between 2017 and 2021 in Manaus. An Overall prevalence estimate of 15.44% (23/149) was calculated from our two rural collection sites; a prevalence of 1.22% (4/328) was estimated at our periurban collection site, and an overall prevalence of 0.35% (1/289) was calculated from our two urban clinic collections. Our data suggest that in the urban areas of Manaus, where the parasites are very likely vectored by the same species of mosquito that historically vectored Wuchereria bancrofti (Culex quinquefasciatus), prevalence levels are very low and possibly maintained by an influx from rural areas where sylvatic reservoirs and/or more favorable vector transmission dynamics maintain high prevalences.