Characteristics of influenza A (H3N2) virus hemagglutinin genes in Fujian province from 2014 to 2016
10.3760/cma.j.issn.0254-5101.2018.11.007
- VernacularTitle:2014—2016年福建省H3 N2亚型流感病毒血凝素基因特征分析
- Author:
Yanhua ZHANG
1
;
Hongbin CHEN
;
Lin ZHAO
;
Wenqiong XIU
;
Jianfeng XIE
;
Yuwei WENG
;
Kuicheng ZHENG
Author Information
1. 福建省疾病预防控制中心 福建省人兽共患病研究重点实验室
- Keywords:
Influenza A subtype H3N2;
Hemagglutinin (HA);
Genetic characteristic;
Mutation
- From:
Chinese Journal of Microbiology and Immunology
2018;38(11):841-847
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the genetic characteristics and mutations in hemagglutinin ( HA) genes of influenza A subtype H3N2 viruses isolated in Fujian province during 2014—2016. Methods HA gene fragments of 44 randomly selected influenza A (H3N2) viruses were amplified by RT-PCR and then sequenced by Sanger sequencing. Obtained sequences were analyzed by bioinformatics software and on-line websites. Results Pair-wise similarity among HA genes of the 44 strains was between 97. 3%-100. 0% at nucleotide level. The average variations between epidemic strains and corresponding vaccine strains in the year of 2014, 2015 and 2016 were 0. 012, 0. 008 and 0. 009, respectively. The genotype of epidemic strains in 2014 was 3C. 3a rather than 3C. 1 of the vaccine strain. Notably, variations at some antigenic sites, re-ceptor binding sites ( RBSs) and N-Glycosylation sites were identified despite the fact that the genotypes were identical between epidemic and vaccine strains in 2015 and 2016. Conclusion Variations at the HA genes of influenza A (H3N2) viruses in Fujian province occurred during the year of 2014—2016, reflecting the ability of circulating strains to escape the vaccine-induced immunity. Sustainable influenza surveillance and prompt identification of viral variants would benefit influenza prevention and control.
