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Serology for Neosporosis, Q fever and Brucellosis to assess the cause of abortion in two dairy cattle herds in Ecuador

Changoluisa, Darwin, Rivera-Olivero, Ismar A., Echeverria, Gustavo, Garcia-Bereguiain, Miguel Angel, de Waard, Jacobus H.
BMC veterinary research 2019 v.15 no.1 pp. 194
Brucella melitensis biovar Abortus, Coxiella burnetii, Neospora caninum, Q fever, antibodies, blood sampling, blood serum, brucellosis, calves, case-control studies, cattle diseases, cows, dairy cattle, farms, herds, livestock and meat industry, neosporosis, pathogens, pregnancy, serology, seroprevalence, veterinary medicine, Ecuador
BACKGROUND: Determining the infectious cause of abortion in cattle is difficult. This case-control study was set up to investigate the infectious causes of abortion by determining the seroprevalence of three reproductive pathogens in dairy cattle in Ecuador and their association with abortion: Brucella abortus, Neospora caninum and Coxiella burnetii. RESULTS: Ninety-five blood samples were obtained from cows that had experienced a mid- or late gestation abortion of their first calf and seventy-seven samples from a control group of cows with the same age that did not experience abortion problems. No antibodies were detected for B. abortus in any of the serum samples, but a high seroprevalence for both C. burnetii (52.9%) and N. caninum infection (21.5%) was found in group of cows. The seroprevalence of N. caninum infection in cattle that had experienced abortions was significantly higher (pā€‰<ā€‰0.05) than the seroprevalence in the control cows on one of the cattle farms, but no association between abortion and seropositivity for C. burnetii was found. CONCLUSION: We conclude that Neosporosis plays an important role in the epidemiology of abortion on one cattle farm, but that Q fever is apparently not an important cause for abortion in this setting.