Association between Chlamydia psittaci seropositivity and abortion in Italian dairy cows

Although the seroprevalence of Chlamydia psittaci is widespread in Italian dairy herds, its role in inducing genital disorders has not been elucidated . We therefore set up a case-control study to compare seroprevalence to C. psittaci in an aborted-cow population and in a randomly selected control gr oup in the province of Parma (the Po Valley of northern Italy). The true se roprevalence (45%) in aborted cows was significantly higher than that in th e control group (24%) (adjusted odds ratio = 2.53). (C) 2001 Elsevier Scien ce B.V. All rights reserved.