(Equine viral rhinopneumonitis, Equine abortion virus)
Etiology and Epidemiology
Equine herpesvirus 1 (EHV-1) and equine herpesvirus 4 (EHV-4) comprise two antigenically distinct groups of viruses previously referred to as subtypes 1 and 2 of EHV-1. Both viruses are ubiquitous in horse populations worldwide and produce an acute febrile respiratory disease upon primary infection, characterized by rhinopharyngitis and tracheobronchitis. Outbreaks of respiratory disease occur annually among foals in areas with concentrated horse populations. Most of these outbreaks in weanlings are caused by strains of EHV-4. The age, seasonal, and geographic distributions vary and are determined by immune status and horse population. In individual horses, the outcome of exposure is determined by viral strain, immune status, pregnancy status, and possibly age. Infection of pregnant mares with EHV-4 rarely results in abortion.
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برچسب : equine herpesvirus infection,equine herpesvirus 1 and 4 infections an update, نویسنده : dr-movahedia بازدید : 346 تاريخ : چهارشنبه 17 شهريور 1395 ساعت: 0:21