EN
Sera taken from 449 cows which aborted in years 1991-1994 have been assessed by the complement fixation test for the presence of Q-fever antibodies. It was found that 10.7% of the animals had antibodies against Coxiella burnetii II antigen. Moreover, in the examinations repeated three times on 150 cows coming from a farm in which several cases of abortions were observed, about 15% of seroreagents were noted. At the same time 14 persons working in that farm and additionally 22 humans drinking milk of the cows were tested by the fluorescent antibody test. Specific antibodies against C. burnetii I and II were detected; however lower concentrations of antibodies were found against C. burnetii phase I.