For horses taking part in equine actions or being transported throughout state strains, proof of a adverse Coggins check is required. Foal diarrhea as a outcome of rotavirus infection can be a severe problem on some breeding farms. Therefore, pregnant mares must be vaccinated IM at 8, 9, and 10 mo of gestation. It is a vaccine to be used specifically situations or areas of excessive endemicity. Vaccination is recommended in endemic areas, corresponding to close to freshwater streams, rivers, ponds, and heavily irrigated pastures. Although the vaccine might reduce the impression of the illness, it seems not to stop abortion in pregnant mares.