Genetic characteristics of H9N2 avian influenza viruses isolated from free-range poultry in Eastern China, in 2014-2015

Poultry Science
Caihui ZhuGuimei He

Abstract

Circulating H7N9 influenza viruses in live poultry markets continue to pose a threat to human health. Free-range poultry, one of the sources for these markets, are common in China as well as in many developing countries. Because the H9N2 virus could be a source of internal genes for the H7N9 virus, we conducted surveillance in free-range poultry and live poultry markets to study the evolution of H7N9 and H9N2 viruses in Eastern China. We found 28 samples positive for the H9N2 virus (a rate of 3.2%), but no positive samples for the H7N9 virus. Six representative H9N2 isolates were sequenced and analyzed, and the results showed that these viruses shared high nucleotide identities (99.0 to 100%) and were in a same branch in the phylogenetic trees. All these 6 viruses are closely clustered with Zhejiang H9N2 chicken isolates, and belonged to genotype G57, along with some novel H7N9 strains and H9N2 strains circulating in humans in China. We hope that surveillance of AIVs in free-range poultry will be strengthened for further identification more genetic diversity.

Citations

Dec 20, 2018·EFSA Journal·UNKNOWN European Food Safety AuthorityFrancesca Baldinelli
Sep 3, 2020·EFSA Journal·UNKNOWN European Food Safety AuthorityFrancesca Baldinelli
Mar 28, 2019·EFSA Journal·UNKNOWN European Food Safety AuthorityFrancesca Baldinelli
Sep 3, 2020·EFSA Journal·UNKNOWN European Food Safety AuthorityFrancesca Baldinelli
Jul 7, 2020·EFSA Journal·UNKNOWN European Food Safety AuthorityFrancesca Baldinelli
Jul 7, 2020·EFSA Journal·UNKNOWN European Food Safety AuthorityFrancesca Baldinelli
Dec 22, 2020·EFSA Journal·UNKNOWN European Food Safety Authority, European Centre for Disease Prevention and Control and European Union Reference Laboratory fFrancesca Baldinelli
Dec 8, 2020·EFSA Journal·UNKNOWN European Food Safety AuthorityFrancesca Baldinelli
Mar 16, 2021·EFSA Journal·UNKNOWN European Food Safety AuthorityFrancesca Baldinelli

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