Preliminary entomological and parasitological studies in humboldt, Aripuanã, Mato Grosso State, Brazil

• Autor(a) principal: Lainson, Ralph
• Data de Publicação: 1976
• Outros Autores: Ward, Richard Douglas, Young, D. G, Shaw, Jeffrey Jon, Fraiha Neto, Habib
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Digital do Instituto Evandro Chagas (Patuá)
• Texto Completo: https://patua.iec.gov.br/handle/iec/775
• topic: Fauna / análise; Psychodidae / classificação; Leishmaniose Cutânea / prevenção & controle; Leishmaniose Cutânea / classificação; Mato Grosso (MT); Aripuanã (MT)

The preliminary results are given of studies on the sandfly fauna (Diptera: Psychodidae) in forest surrounding the Humboldt Research Centre, Município of Aripuanã, Mato Grosso State, Brazil.. A total oi 712 sandflies were obtained, including 26 different species: of these, 387 were caught oíf human bait; 317 from tree-trunks; 4 in a malaise- -trap; 3 in rodent baited oil traps; and 1 in a l1ghUrap. Man-biting species were absent or very rare during studies in the dry season (August and September, 1974), but relativeIy abundant at the end of the rainy season (June, 1975): this suggests a seasonal transmission of leishmaniasis. The species at present known as Lutzomyia anduzei oi Floch & Abonnenc (1942) was a major man-biter. this species is an important vector of cutaneous leishmaniasis in North Pará, Brazil, and could be responsible for transmission in Aripuanã. Among a tOlt~1 of 349 female sandflies dissected, promastigote fl~gellate3 were found in 2 Lutzomyia yuilli; ep~mastigote flagellates in 1 L. yuil1i; a microsporidian in Psychodopygus (1) complexus; a gregarine, probably Monocystis chagasi, in P. davisi; and a nematode larva in P. complexus. Inoculation of the promastigote flagellates into the skin of hamsters failed to give Leishmanla infections: possibly they were developmental stages of some other parasite. Two research workers of Project RADAM acquired cutaneous leishmaniasis in the Humboldt area; and 6 cases of malaria were diagnosed, 3 due to P. falciparum and 3 to P. vlvax. Transmission of malaria was shown to be taking place in the camp site itself. Finally, man-biting "black-flies" (Diptera: Simuliidae) were found to be a serious problem, necessitating constant use of insect repellent.