944 serum samples of horses, collected in 1988 and 1989, were examined for the occurrence of antibodies against equine arteritis virus by a microneutralizations test. In 10.9% of all sera reactors could be found. The distribution of seropositive horses varied from 4.6% (Salzburg) to 15.7% (Lower Austria). From Tyrol and Vorarlberg no samples could be obtained. It was not possible, to correlate clinical symptoms (infertility, respiratory symptoms, fever and edema) with the infection. It is assumed, that the disease appears in Austria only in a clinical inapparent form.
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