Jiang W, et al. Antigenic Variant of Highly Pathogenic Avian Influenza A(H7N9) Virus, China, 2019. Emerg Infect Dis. 2020 Feb 17;26(2)
In China, influenza A(H7N9) virus appeared in 2013, then mutated into a highly pathogenic virus, causing outbreaks among poultry and cases in humans. Since September 2017, extensive use of the corresponding vaccine, H7-Re1, successfully reduced virus prevalence. However, in 2019, a novel antigenic variant emerged, posing considerable economic and public health threats.
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