h5n1 virus

parasitesymbol hemagglutinin neuraminidase glycoproteins extracellular contamination contaminated microbiology transmission background pathogenic contagious immunology infections veterinary influenza spreading pathology contagion particle isolated pathogen industry outbreak pandemic sickness epidemic parasite virology virulent medicine surface chicken poultry disease science microbe control biology hygiene medical public safety strain global threat health virus white avian fever viral h5n1 bird feed flu