The Role of Horseflies in the Prevalence of Equine Infectious Anemia (EIA) in the Brazilian Pantanal
AbstractThe Equine Infectious Anemia (EIA) is an incurable disease caused bya virus belonging to the genus of the AIDS virus (Lentivirus, family Retro-viridae). EIA has a high prevalence in the Brazilian Pantanal and recentlyBorges at al.  have found highly distinct values for the disease preva-lence in non-ooded andВ ooded farm areas, which are 0.85% and 42.10%,respectively. This phenomenon has been credited to a much higher popu-lation of the insect vector, the horseies (Tabanus sp.), on wetlands whencoupled with warm temperatures. Based on the literature we redened thevalues of the model parameters presented in , emphasizing the proba-bility of EIA transmission by the insect vector. From simulation scenarioswe showed that the high prevalence of the disease could not be attributedonly to horseies. In fact, we found that the insect vector has an almostnegligible role in the disease transmission process and we concluded that itis necessary to examine carefully the management of animals in theВ oodedregions.
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