Abstract:
:Human infection with avian influenza A(H9N2) virus was identified in Bangladesh in 2011. Surveillance for influenza viruses in apparently healthy poultry in live-bird markets in Bangladesh during 2008-2011 showed that subtype H9N2 viruses are isolated year-round, whereas highly pathogenic subtype H5N1 viruses are co-isolated with subtype H9N2 primarily during the winter months. Phylogenetic analysis of the subtype H9N2 viruses showed that they are reassortants possessing 3 gene segments related to subtype H7N3; the remaining gene segments were from the subtype H9N2 G1 clade. We detected no reassortment with subtype H5N1 viruses. Serologic analyses of subtype H9N2 viruses from chickens revealed antigenic conservation, whereas analyses of viruses from quail showed antigenic drift. Molecular analysis showed that multiple mammalian-specific mutations have become fixed in the subtype H9N2 viruses, including changes in the hemagglutinin, matrix, and polymerase proteins. Our results indicate that these viruses could mutate to be transmissible from birds to mammals, including humans.
journal_name
Emerg Infect Disjournal_title
Emerging infectious diseasesauthors
Shanmuganatham K,Feeroz MM,Jones-Engel L,Smith GJ,Fourment M,Walker D,McClenaghan L,Alam SM,Hasan MK,Seiler P,Franks J,Danner A,Barman S,McKenzie P,Krauss S,Webby RJ,Webster RGdoi
10.3201/eid1909.130336subject
Has Abstractpub_date
2013-01-01 00:00:00issue
9eissn
1080-6040issn
1080-6059journal_volume
19pub_type
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