Vaccination of stallions with a modified live equine viralarteritis virus

Sixteen stallions were vaccinated with modified live virus- EVA vaccine. Paired stallions were assigned a group of four susceptible mares to breedtwice by natural service between 10 and 25 days postvaccination. No significant adverse changes in hematologic parameters or temperatures that could be related to vaccination were observed. Vaccinated stallions showed no overt signsof illness and attempts to isolate the virus from buffy coat cells and semen were unsuccessful. Susceptible mares bred to these stallions between 10 and 25 days postvaccination failed to seroconvert