Transmission cycles of arboviruses in Madagascar

摘要: Some arboviruses are highly pathogenic for Men or animals. Arboviruses epidemiological patterns in Madagascar were determined by entomological, serological, and virological surveys. We listed potentials vectors Madagascar. Entomological results generated us during five years, as well prior to, shown. caught more than 150,000 hematophagous arthropods, belonging to 107 species at least. 3 of these new. 4183 inoculation pools done. studied serollogically (by HI test) samples collected from 563 animals 626 Men. Our data, agreement with others 1965 1982, demonstrate that circulate the whole island. Positive reactions obtained mainly Flavivirus, particular West-Nile. Nine various arboviruses, including dengue-2 virus isolated an individual having travelled La Reunion, have been isolated. Dakar-Bat Mengo observed. transmission cycles following viruses: Babanki, West-Nile, Rift Valley Fever, Crimean-Congo Hemorrhagic MMP 158, Ngari, Perinet Andasibe; last 2 being endemics. In relation biogeographic characteristics (long-term isolation, scarce communications, high endemicity, low vertebrate density), we evaluated risk potential introduction amplification (dengue, yellow fever, japanese encephalitis, Sindbis Chikungunya). The is very dengue due presence susceptible mosquitoes strains while circulates East Africa Indian Ocean area. This seems be intermediate other arboviruses.