Influenza in BirdsInfluenza A Virus, H5N1 SubtypeHolidaysPoultryInfluenza A Virus, H7N1 SubtypeHerpesvirus 1, MeleagridInfluenza A Virus, H7N7 SubtypeInfluenza A Virus, H7N2 SubtypeBirdsHemagglutinin Glycoproteins, Influenza VirusAnseriformesChickensVirus SheddingAnimals, WildViral TropismReassortant VirusesDucksPoultry DiseasesNewcastle disease virusOrthomyxoviridae InfectionsInfluenza VaccinesSpecific Pathogen-Free OrganismsNeuraminidaseDisease OutbreaksVirulenceInfluenza A virusInfluenza, HumanAntibodies, ViralReverse Transcriptase Polymerase Chain ReactionVirus ReplicationImmunohistochemistry