Influenza in horses.
D000818:Animals; D006734:Horse Diseases / Q000453:epidemiology* / Q000517:prevention & control; D006736:Horses; D009975:Orthomyxoviridae / Q000302:isolation & purification; D009976:Orthomyxoviridae Infections / Q000453:epidemiology / Q000517:prevention & control / Q000662:veterinary*