Evidence for genetic variation of Eurasian avian influenza viruses of subtype H15: the first report of an H15N7 virus
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Since the first detection of H15 avian influenza viruses (AIVs) in Australia in 1979, only seven H15 strains have been reported. A new H15 AIV was detected in Ukraine in 2010, carrying the unique HA-NA subtype combination H15N7. This virus replicated efficiently in chicken eggs, and antisera against it reacted strongly with the homologous antigen, but with lower titers when using the reference Australian antigen. The amino acid motifs of the HA cleavage site and receptor-binding site were different from those in the Australian viruses. The new virus, together with an H15 virus from Siberia from 2008, constitutes a new clade of H15 AIV isolates.
KeywordsAvian Influenza Virus Basic Local Alignment Search Tool Hemagglutination Inhibition Wild Duck Internal Gene Segment
The authors gratefully acknowledge Tina Seehafer for the technical assistance, and the ornithologists from Azov-Black Sea Ornithological Station, especially Dr. R.M. Chernychko, for identification of birds’ species and providing information on biological and ecological characteristics of wild birds from the Azov-Black Sea region of Ukraine. This research was funded partially by USDA project P444, through the Ukrainian Science and Technology Center.
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