Type A influenza virus infection of duck flocks in Hungary. (Type 3, 4 and 6 avian influenza viruses).
D000818:Animals; D004372:Ducks; D006814:Hungary; D009975:Orthomyxoviridae / Q000302:isolation & purification*; D009976:Orthomyxoviridae Infections / Q000382:microbiology / Q000662:veterinary*; D011201:Poultry Diseases / Q000382:microbiology*