| [frequency of abortion and seroprevalence of the principal diseases causing ovine infectious abortion in the area of rabat (morocco)]. | a survey was carried out on 23 sheep flocks to estimate the frequency of abortion as well as the prevalence of antibodies against abortive infections. during the visit of each farm, a questionnaire was completed with the collaboration of the owner and blood samples were collected from all aborted ewes and some of those with normal lambing. a rate of 7% abortion was reached in both aborted and normally lambed ewes. anti-chlamydia psittaci antibodies were the most frequently detected (14 flocks). ... | 1990 | 2288452 |