IIBYT   23944
INSTITUTO DE INVESTIGACIONES BIOLOGICAS Y TECNOLOGICAS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
EXPOSURE OF FREE RANGING BIRDS TO ST. LOUIS ENCEPHALITIS AND WEST NILE VIRUSES (FLAVIVIRUS) IN AGRICULTURE AND CATTLE RAISING LANDSCAPES IN ARGENTINA
Autor/es:
D. GALLEGO; R. GALLARDO; JM. GRANDE; AP. MANSILLA; M. LARREA; BS. KONIGHEIM; A. FARANA; DL. ARIAS BUILES; A. DIAZ
Lugar:
New Orleans
Reunión:
Congreso; 67th Anual Meeting American Society of Tropical Medicine and Hygiene; 2018
Institución organizadora:
American Society of Tropical Medicine and Hygiene
Resumen:
Anthropogenic changes affect biological communities of host and vectorsdriving arbovirus activity. In general, urban and agricultural landscapes hostless avian and mosquito diversity and frequently these are dominated byfew species. The St. Louis encephalitis (SLEV) and West Nile viruses (WNV)are infectious agents that have emerged and re-emerged worldwide.The aim of this work was to evaluate activity of SLEV and WNV in birdcommunities in agricultural and cattle raising landscapes. Field workwas carried out in four different sites in La Pampa province (Argentina)between February and June 2017 (summer and fall). Avian sera sampleswere analyzed by plaque reduction neutralization test. GeneralizedLinear Models were performed to determine the effect of bird speciesand sampling site on the infection of SLEV/WNV. Neutralizing antibodiesagainst SLEV were found in 45 out of 348 samples (12.9%) while WNVseroprevalence overall was 3.4% (12/348). House Wren (Troglodytesaedon), House Sparrow (Passer domesticus), Monk Parakeet (Myiopsittamonachus), Rufous Hornero (Furnarius rufus), Rufous-collared Sparrow(Zonotrichia capensis) and Picui Ground-dove (Columbina picui) were themost exposed avian species to SLEV. On the other hand, Shiny Cowbird(Molothrus bonariensis), Rufous Hornero (Furnarius rufus), Monk Parakeet(Myiopsitta monachus), and Picui Ground-dove (Columbina picui) showedthe highest seroprevalence values for WNV. The sampling site was asignificant variable affecting the chance to detect an infected bird by SLEV/WNV. Sites located in northern area showed higher seroprevalence valuesthan those located southern. Our data confirm the geographic expansionof WNV in Argentina from center region to southern latitudes. Northernarea of La Pampa is subject of intense agricultural activities (soy, corn,wheat) whilst southern area has a mixed of agricultural and cattle raisingactivities. These preliminary data indicate a potential positive effect ofagricultural activities over the SLEV/WNV activity.