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Res Vet Sci. 2020 Mar 10;130:203-206. doi: 10.1016/j.rvsc.2020.03.017. [Epub ahead of print]

Amino acid substitutions involved in the adaptation of a novel H7N7 avian influenza virus in mice.

Author information

1
State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, National Medical for Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310003, China. Electronic address: wuhaibo@zju.edu.cn.
2
State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, National Medical for Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310003, China.
3
State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, National Medical for Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310003, China. Electronic address: flwnp@zju.edu.cn.

Abstract

The H7N7 avian influenza viruses can infect humans and poses a great threat to human health. To identify the amino acid substitutions that are associated with adaptation of avian-origin H7N7 virus to mammals, adaptation of the H7N7 virus was carried out by serial lung-to-lung passage in mice. Genomic analysis of the mouse-adapted virus revealed amino acid changes in the PB2 (E525G, M645I, and D701N), NP (I475V), HA(D103N), and NA(K142E) proteins. The adapted H7N7 virus was more virulent in mice than the wild-type virus. Our results suggest that continued surveillance of poultry populations for these substitutions in the H7N7 virus is required.

KEYWORDS:

Genetic variability; H7N7 avian influenza virus; Mammals; Substitutions; Virulence; Zoonotic potential

PMID:
32200160
DOI:
10.1016/j.rvsc.2020.03.017

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