Original Article
Genetic characteristics of human enterovirus A type 71 in Qinghai province during 2016-2017
Lixia Fan, Weijun Wang, Zhuoma Ba, Shengcang Zhao, Chonghai Li, Shuangying Jiang, Dongmei Yan, Tianjiao Ji
Published 2018-10-30
Cite as Chinese J Exp Clin Virol, 2018, 32(5): 501-504. DOI: 10.3760/cma.j.issn.1003-9279.2018.05.011
Abstract
ObjectiveTo investigate the genetic characteristics of enterovirus A 71 (EV-A71) and etiological features of hand, foot and mouth disease (HFMD) in Qinghai province from 2016 to 2017.
MethodsSpecimens were collected from HFMD patients in Qinghai province, and detected by real-time reverse transcription-polymerase chain reaction (RT-PCR). For EV-A71 positive samples, virus was isolated and RNA was extracted, and then VP1 coding region was amplified by RT-PCR. The phylogenetic tree was constructed by comparing with other genotypes and sub-genotypes strains of EV-A71.
ResultsIt was shown that 114 strains of EV-A71 were isolated in Qinghai province from 2016 to 2017, which all belonged to genotype C4a, and could be divided to two different lineages by phylogenetic analysis. From 2016 to 2017, the epidemic strains of EV-A71 in the different transmission chains of Qinghai province was closely related to other provinces of China.
ConclusionsC4a was the dominant genotype of EV-A71 in Qinghai province from 2016 to 2017, and no other genotype was detected. In addition, EV-A71 isolated from Qinghai province co-evolved with EV-A71 in other provinces of China.
Key words:
Hand, foot and mouth disease; Human enterovirus group A type 71; Subgenotype of C4a
Contributor Information
Lixia Fan
Qinghai Center for Disease Control and Prevention, Xining 810007, China
Weijun Wang
Qinghai Center for Disease Control and Prevention, Xining 810007, China
Zhuoma Ba
Qinghai Center for Disease Control and Prevention, Xining 810007, China
Shengcang Zhao
Qinghai Center for Disease Control and Prevention, Xining 810007, China
Chonghai Li
Qinghai Center for Disease Control and Prevention, Xining 810007, China
Shuangying Jiang
Qinghai Center for Disease Control and Prevention, Xining 810007, China
Dongmei Yan
National Institute for Viral Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing 102206, China
Tianjiao Ji
National Institute for Viral Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing 102206, China