Journal
VIRUS GENES
Volume 37, Issue 2, Pages 144-152Publisher
SPRINGER
DOI: 10.1007/s11262-008-0248-7
Keywords
free-flying water birds; influenza virus; M gene; phylogenetic analysis
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Funding
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
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During 2000-2007, 218 influenza viruses of 28 different combinations of HA (H1-H13) and NA (N1-N9) subtypes were isolated from fecal samples of free-flying water birds at two distant lakes in Hokkaido, Japan. Phylogenic analysis of the matrix (M) genes of 67 strains, selected on the basis of their subtype combinations, revealed that A/duck/Hokkaido/W95/2006 (H10N8) was a reassortant whose M gene belonged to North American non-gull-avian and the other seven genes to Eurasian non-gull-avian lineages. The M genes of other 65 strains belonged to Eurasian non-gull-avian and the one to Eurasian-gull lineages. The M genes of 65 strains were grouped into three different sublineages, indicating that influenza viruses circulating in different populations of free-flying water birds have evolved independently in nature.
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