APPROACH ON RISK FACTORS OF BOVINE TRYPANOSOMOSIS DUE TO Trypanosoma vivax IN THE BOLIVIAN AND BRAZILIAN PANTANALS
ABSTRACT Trypanosoma vivax caused between 1995 and 1997 a devastating disease in Bolivian and Brazilian Pantanals. These regions are very important beef cattle breeding in Brazil and Bolivia. The principal clinical signs of bovine trypanosomosis in livestock were anemia, severe leucopenia, and abortion. The purpose of the present study was to analyze the risk factors of the natural bovine trypanosomosis in the Bolivian and Brazilian Pantanals. We concluded that the principal risk factors related to T. vivax transmission in the Bolivian and Brazilian Pantanals were the transportation by foot, because the conditions for acquisition or transmission of T. vivax were greatest at the numerous resting places along the route, the use of contaminated needles during vaccinations, and transmission by tabanids during the rainy season. The fauna contamination should be also considered. Key-words: Bovine trypanosomosis, Trypanosoma vivax, risk factors, Bolivia, Brazil ABORDAGEM SOBRE OS FATORES DE RISCO DA TRIPANOSOMOSE BOVINA DEVIDO AO Trypanosoma vivax NOS PANTANAIS BOLIVIANO E BRASILEIRO RESUMO O Trypanosoma vivax causou entre 1995 e 1997 doença devastadora nos Pantanais da Bolívia e Brasil. Estas regiões são importantes criatórios de bovinos de corte nos dois países. Os principais sinais clínicos da tripanosomose bovina foram anemia, leucopenia severa e aborto. O propósito do
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