NEWER OBSERVATIONS IN THE EPIZOOTIOLOGY O F THE EQUINE VIRAL ARTERITIS

This virus-induced disease of horses goes with acute symptoms: fever, oedema and abortion. The EVA occurs all over the world. In Hungary the rate of seropositive blood sera increased: in 1992: 27.8% of 201, in 1993: 33.9% of 177 and in the first half of the year 1994: 62.8% of 44 2 samples were positive. It seems to occur the infection in Hungary in subclinical form, and there was not noted abortions en mass, a justif ied EVA infection subsequently. The picture of the disease described i n the Hungarian textbook, edited in 1985 (cit. 31), is valid and good at the present time too, but some details, as the occurrence, diagnost ic methods of the EVA and most of all the judgment of the infected sto cks were changed. As the EVA belongs to the diseases of list ''B'' (OI E), the authors propose - in the light of the Hungarian equine export to some countries - to elaborate a control program for prevent the spr eading of the infection by the carrier animals in Hungary.