isolation and characterization of influenza a viruses from environmental water at an overwintering site of migratory birds in japan.the izumi plain in kagoshima prefecture, japan, is an overwintering site of more than 10,000 cranes. the wet paddy areas are artificially created to provide roosting sites for the cranes every winter. since wild ducks, known to be a natural reservoir of influenza a viruses, also overwinter in this area, the cranes' roost water likely serves as a source of influenza a virus infection. to assess this potential risk, we collected 126 water samples from the cranes' roost in the 2012/2013 winter seas ...201526392284
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