Equine rhinopneumonitis virus as a cause of abortion in pregnant mares.
D000034:Abortion, Veterinary / Q000209:etiology*; D000818:Animals; D005260:Female; D006566:Herpesviridae Infections / Q000662:veterinary*; D006734:Horse Diseases; D006736:Horses; D011247:Pregnancy; D011270:Pregnancy, Animal