Abstract
After many years of intensive study, concepts concerning epizootic bovine abortion (EBA) are undergoing fundamental changes. The demonstration that the Ornithodoros coriaceus tick is a natural vector of the infection led to the isolation of a virus which, although not an abortifacient agent per se , appears to be associated in O. coriaceus ticks with an agent which causes what is believed to be EBA. The nature of this agent is as yet unknown. However, such findings provide increasing evidence that an agent, or agents, in addition to the chlamydia which was isolated during the early studies of the disease, are involved etiologically in EBA. Indications are, therefore, that EBA is a disease syndrome, rather than a specific disease entity caused by a single etiologic agent.
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