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  • Title: Viraemia and abortions are not prevented by two commercial equine herpesvirus-1 vaccines after experimental challenge of horses.
    Author: Bürki F, Rossmanith W, Nowotny N, Pallan C, Möstl K, Lussy H.
    Journal: Vet Q; 1990 Apr; 12(2):80-6. PubMed ID: 2163560.
    Abstract:
    Eighteen horses, vaccinated on a number of occasions over a period of 12 to 20 months with either a live equine herpesvirus-1 (EHV-1) or an inactivated EHV-1 vaccine, were challenged by the intranasal instillation of the subtype 1 virus isolated from the 1983 outbreak of abortion and paralytic disease at the Lipizzan Stud, Piber, Austria. The prechallenge serum titres of all vaccinated horses were remarkably low, although most horses had received their last vaccine dose only 3 weeks before test-infection. Higher titres were obtained with the inactivated product than with the live virus vaccine. However, no obvious differences were found between the two vaccines in their ability to prevent disease, in that all vaccinated and two 'sentinel' horses became infected and developed viraemia and some degree of clinical disease after challenge; five of the 10 in-foal mares aborted.
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