%0 Journal Article
%T Evolution and Antigenic Drift of Influenza A (H7N9) Viruses, China, 2017-2019.
%A Zhang J
%A Ye H
%A Li H
%A Ma K
%A Qiu W
%A Chen Y
%A Qiu Z
%A Li B
%A Jia W
%A Liang Z
%A Liao M
%A Qi W
%J Emerg Infect Dis
%V 26
%N 8
%D 08 2020
%M 32687047
%F 16.126
%R 10.3201/eid2608.200244
%X After a sharp decrease of influenza A(H7N9) virus in China in 2018, highly pathogenic H7N9 viruses re-emerged in 2019. These H7N9 variants exhibited a new predominant subclade and had been cocirculating at a low level in eastern and northeastern China. Several immune escape mutations and antigenic drift were observed in H7N9 variants.