scientific sampling of eggs in poor condition, analysis of avian influenza in humans

h7n9 h7n3 virus flu avian eradicate influenza h1n2 h9n2 bird health disease chicken medical epidemic pandemic farm animal domestic infection red poultry vaccine science h5n1 symptoms pathogen beak microbiology sickness biology pathology contagious virology sick medicine microbe infectious care scientific h7n7 diagnosis laboratory bacterial strain h2n1 egglaying sampling eggs poor condition analysis humans conceptual