Data from 9,963 formularies of equines from Acre State (1986-1996) examined for equine infectious anemia (EIA) by the AGID test were analyzed. The socio-ecological regions in Alto Juruá, Alto Acre and Alto Purus rivers basins showed the highest levels of disease, characterizing an association between these regions and positivity. These risk regions are border areas with the State of Amazonas, Peru and Bolivia, far from the capital city of the State of Acre (Rio Branco) and access by roads is often difficult. The regions Oriental and Rio Branco showed low levels of positivity. No differences were found regarding to animal species, sex, race and age.
Equine; equine infectious anemia; socio-ecological regions; frequency; Acre State; Brazil
