properties and dissemination of h5n1 viruses isolated during an influenza outbreak in migratory waterfowl in western china.h5n1 influenza a viruses are widely distributed among poultry in asia, but until recently, only a limited number of wild birds were affected. during late april through june 2005, an outbreak of h5n1 virus infection occurred among wild birds at qinghai lake in china. here, we describe the features of this outbreak. first identified in bar-headed geese, the disease soon spread to other avian species populating the lake. sequence analysis of 15 viruses representing six avian species and collected a ...200616731936
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