| perpetuation of influenza a viruses in alaskan waterfowl reservoirs. | to provide information on the mechanism of perpetuation of influenza viruses among waterfowl reservoirs in nature, virological surveillance was carried out in alaska during their breeding season in summer from 1991 to 1994. influenza viruses were isolated mainly from fecal samples of dabbling ducks in their nesting places in central alaska. the numbers of subtypes of 108 influenza virus isolates were 1 h2n3, 37 h3n8, 55 h4n6, 1 h7n3, 1 h8n2, 1 h10n2, 11 h10n7, and h10n9. influenza viruses were a ... | 1995 | 7646350 |