Abstract

Abstract Extract The occurrence of infectious equine abortion in the United States of America was first described in 1932 (Dimock and Edwards, 1932). These workers thought that the cause might be a virus (Dimock and Edwards, 1933) possibly equine influenza virus (Doll, 1972) but it was not until the clinical syndromes of equine influenza, equine viral arteritis and equine viral rhinopneumonitis were defined that the various infectious causes of equine abortion could be differentiated (Jones et al., 1948; Doll and Kintner, 1954; Doll et al., 1957).

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