Associação do histórico de abortamento com a presença de anticorpos anti-Neospora caninum em vacas leiteiras

Abstract

Neospora caninum is an important cause of abortions in dairy cattle, leading to severe economic losses. The objective of this study was to determine the association of serum antibodies against N. caninum with a history of abortion in dairy cows. A total of 46 dairy cows from nine dairy farms were evaluated; 28 with a history of one or more abortions and 18 without a history of abortions. Antibodies against N. caninum were detected by indirect immunofluorescence, and the reaction was considered positive when the titer was ?1:50. Serum antibodies against N. caninum were detected in 39.1% (18/46) of all cows, 57.1% (16/28) of cows with a history of abortion, and 11.1% (2/18) of cows without a history of abortion. Among the seropositive cows, 88.9% had a history of abortion. All farms showed at least one animal positive for N. caninum. These results indicate an association between seropositivity for N. caninum and a history of abortion in cows. Cows with a history of abortion were 10.6 times more likely to be seropositive for N. caninum than cows without a history of abortion. Therefore, we concluded that there is an association between a history of abortion and the presence of antibodies against N. caninum in dairy cows.

Neospora caninum and Toxoplasma gondii: seroprevalence and associated factors in cows from milk farms of Toledo, Parana, Brazil

“…Mazuz et al (2014) in a study of pregnant cows, found that the percentage of abortions in N. caninum seropositive cows was three times higher than in seronegative cows. Frigotto, Genz, Nino, Zulpo and Garcia (2018), studying N. caninum in dairy cows, observed an association between seropositive cows and history of abortion; the authors reported that cows with a history of abortion were 10.6 times more likely to be seroreactive than cows without a history of abortion. Our work further reinforces the relationship between abortion and N. caninum seropositivity, but we must not forget that T. gondii was also identified as a risk factor associated with abortion, so this etiological agent should also be included as a differential in reproductive cases of this species.…”