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Novel reassortant H7N2 originating from the H7N9 highly pathogenic avian influenza viruses in China, 2019

In recent years, evolution, reassortant, pathogenicity and antigenicity of H7N9 AIVs have been documented in this journal.1–4 Since 2013, over 1400 cases of human infection with novel H7N9 influenza viruses have been reported in China, associated with a high rate of mortality.5 Studies on circulating H7N9 influenza viruses have suggested origination from poultry.6 However, strains isolated from live bird markets displayed low pathogenicity in poultry.7 H7N9, a highly pathogenic avian influenza virus strain (HPAIV) has led to over 17 infection outbreaks in poultry in China since mid-2016.

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