| characterization of recent h5 subtype avian influenza viruses from us poultry. | in the us, the isolation of h5 subtype avian influenza (ai) viruses has been uncommon in commercial chickens and turkeys, although sporadic isolations have been made from the live bird markets or its supply chain since 1986. in 2002, two different outbreaks of h5 ai occurred in commercial chicken or turkey operations. the first occurred in texas and was identified as a h5n3 subtype ai virus. the second outbreak was caused by a h5n2 virus isolated from a turkey farm in california. in this study w ... | 2004 | 15223555 |