The association of abortion with positive results for different agents and frequencies of positive results between vaginal and milk samples.

The association of abortion with positive results for different agents by real-time PCR and frequencies of positive results between vaginal and milk samples were assessed using the Fisher's exact test. A p value<0.05 was taken as a level of significance. Cases: cows with clinical signs, controls: cows with normal pregnancies and normal parturitions, OR: odds ratio, CI: confidence interval.