Failure to demonstrate equine rhinopneumonitis virus as a cause of abortion in mares in New Zealand

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Abstract
Extract The occurrence of infectious equine abortion in the United States of America was first described in 1932 (Dimock and Edwards, 1932 Bagust, T. J. 1971. The equine herpesviruses. Vet. Bull., 41: 79–92. [Google Scholar] ). These workers thought that the cause might be a virus (Dimock and Edwards, 1933 Bagust, T. J. , Pascoe, R. R. and Harden, T. J. 1972. Studies on equine herpesviruses. 3. The incidence in Queensland of three different equine herpes-virus infections. Aust. vet. J., 48: 47–53. [Google Scholar] ) possibly equine influenza virus (Doll, 1972 Bitsch, V. and Dam, A. 1972. Nervous disturbances in horses in relation to infection with equine rhinopneumonitis virus. Acta vet Scand., 12: 134–136. [Google Scholar] ) 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 Bryans, J. T. 1968. The herpesviruses in diseases of the horse. Proc. Ann. Mtg. Am. Ass. Eq. Pract., Philadelphia, December: 119–125. [Google Scholar] ; Doll and Kintner, 1954 Carter, P. R. , Marshall, R. B. and Jolly, R. D. 1971. A haemolytic variant of Actinobacillus equuli causing an acute septicaemia in a foal. N.Z. vet. J., 19: 264–265. [Taylor & Francis Online] [Google Scholar] ; Doll et al., 1957 Dimock, W. W. and Edwards, P. R. 1932. Infections of foetuses and foals. Bull. 333 Ky agr. Exp. Sta., [Google Scholar] ).