SEROPREVALENCE OF Trypanosoma vivax, Anaplasma marginale, and Babesia bovis IN DAIRY CATTLE

Abstract

In order to determine the prevalence of IgG against Trypanosoma vivax, Anaplasma marginale, and Babesia bovis in dairy cattle in southern Minas Gerais, four hundred cows from 40 dairy farms were randomly selected and distributed in 14 municipalities. Seroprevalence was determined by indirect immunofluorescence assay (IFA). Interviews were conducted to characterize producers and dairy production. Univariate analysis was carried out using chi-square (x2) or Fisher's exact test. The multiple model was constructed with variables associated with p ≤ 0.25 by x2 test using generalized estimating equations (GEE). True prevalence at herd level was 49.6% (31.7-67.5), 100% (92.1-100), and 100% (86.5-100) for T. vivax, A. marginale, and B. bovis, respectively. At individual level, true seroprevalence was 9.9% (6.7-13.1), 96.2% (92.1-99.6), and 93.7% (89.4-97.2), respectively, for T. vivax, A. marginale, and B. bovis. Among the factors adjusted by logistic regression GEE model, "total farm area" (p= 0.021, OR= 0.308, Ic95%= 0.114-0.836) and "fly season" (p= 0.016, OR= 2.133, Ic95%= 1.153-3.948) remained associated with seropositivity for T. vivax. As the State of Minas Gerais is considered non-endemic for T. vivax, producers and veterinarians should be informed about the risk of occurrence of bovine trypanosomiasis.

Association between chronic Anaplasma marginale and Babesia spp. infection and hematological parameters of taurine heifers

“…Infectious tick-borne diseases can directly and indirectly affect the productive and reproductive performances of ruminants. In Brazil, one of the diseases that impact livestock is cattle tick fever (TF), a complex caused by Babesia bovis, Babesia bigemina and/or Anaplasma marginale, which significantly impacts herds in southern Brazil (Lucena et al, 2010) and cause major financial losses for farmers throughout the country (Barbieri et al, 2016).…”

Prevalence study on Trypanosoma vivax in dairy cattle in the Western region on the State of Paraná, Brazil

“…The Pantanal region in the state of Mato Grosso do Sul and the states of Minas Gerais and São Paulo are the locations of the largest numbers of cases of disease caused by T. vivax (MARTINS et al, 2008;CADIOLI et al, 2012;BARBIERI et al, 2016).…”

“…Cases of trypanosomiasis in cattle have now been reported from several states in Brazil, especially in the northern, northeastern, centralwestern and southeastern regions (GUEDES et al, 2008;CADIOLI et al, 2012;COSTA et al, 2013;BARBIERI et al, 2016). In the states of Paraná and Santa Catarina there are still no reports of this parasite, but the disease has the capacity to reach these regions rapidly, particularly through transportation of animals between states, which takes place frequently.…”