Ocorrência de trypanosoma vivax em bovinos de leite da microrregião do Médio Mearim- MA

Abstract

The Brazilian agribusiness grows more and more in the World scenario advanced the economy of the country through the creation of cattle. Assuming favorable positions in the production of, it registered 7,871 million liters of milk in 2019 with a growth of 4.1% in the year of 2018. In a regional context, Maranhão presents excellent favorable conditions for the rise of dairy cattle, however the objectives that affect production and productivity are diseases caused by hemoparasites, highlighting the hematophagous vectors that transmit bovine trypanosomiasis. The objective of this study was to verify the occurrence of Trypanosoma vivax in dairy cattle from the microrregião do Médio Mearim, Maranhão. 235 samples (130 / cows and 105 / calves) were collected from properties in the municipalities of Lima Campos, Pedreiras, Trizidela do Vale, Bernardo do Mearim, Igarapé Grande and Poção de Pedras. The hemoparasitological results of the blood samples resulting from the blood smear, showed a positive animal for T. vivax from the municipality of Porção de Pedras. The microhematocrit technique was performed to determine the percentage of animals with anemia, with a variation of 15% to 65% in the percentage of hematocrit in the analyzed samples, which resulted in 6.88% (15/235) with hematocrit lower than 24% and 93.61% (220/235) with hematocrit above 24%, classified as anemic and non-anemic, respectively. The results using the RIFI technique showed that in 12.77% (30/235) of animals were serum reactive, when doing the individual analysis of each municipality, of the 30 serum reactive animals, Lima Campos corresponded to 20.00% (6 / 30), Pedreiras 16.67% (5/30), Trizidela do Vale 6.67% (2/30), Porção de Pedras 10.00 (3/30), Bernardo do Mearim 23.33% (7/30 ) and Igarapé Grande 23.33% (7/30). While the indirect ELISA technique obtained 8.09% (19/235) reagent serum. When these were analyzed individually, the different results were observed, In Lima Campos, it corresponded to 5.26% (1/19) seropositive, Pedreiras 21.05% (4/19), Trizidela do Vale 26.32% (5 / 19), Poção de Pedras 10.53% (2/19), Bernardo do Mearim 15.79% (3/19) and Igarapé Grande 21.05% (4/19). RIFI and iELISA) it was observed in this study that RIFI was much more sensitive than iELISA. Animals from the Middle Mearim dairy basin, according to the exposed result, indicate the presence of T. vivax as well as the presence of serum reactive antibodies.