WAbalone shriveling syndrome-associated virus
WAlcelaphine gammaherpesvirus 2
WAleutian disease
WAnimal Health Act 1981
WAnimal Health and Welfare Act 1984
WBovine viral diarrhea
WBronchiolitis
WChickenpox
WCommon cold
WCowpox
WCroup
WEbola
WZaire ebolavirus
WEgg drop syndrome
WFeline leukemia virus
WFiloviridae
WFoot-and-mouth disease
WFoot-and-mouth disease virus
WGround squirrel hepatitis virus
WHepatitis E
WInfluenza
WMarburg virus
WMarburg virus disease
WMarburgvirus
WMiddle East respiratory syndrome–related coronavirus
WMonkeypox
WMonkeypox virus
WMononegavirales
WMyxomatosis
WHantavirus hemorrhagic fever with renal syndrome
WVirulent Newcastle disease
WOropouche fever
WPhocine morbillivirus
WPsittacine beak and feather disease
WRabbit hemorrhagic disease
WSea star wasting disease
WTurkeypox virus
WVaricella zoster virus
WVeterinary virology
WViral arthritis (poultry)
WViral hemorrhagic fever
WWest Nile fever
WZaire ebolavirus
WZaire ebolavirus