Norovirus GII.2[P16] Strain in Shenzhen, China: a Retrospective Study

Overview

Journal BMC Infect Dis

Publisher Biomed Central

Specialty Infectious Diseases

Date 2021 Oct 31

PMID 34717565

Citations 2

Authors

Jing Wang

Miao Jin

Hailong Zhang

Yanan Zhu

Hong Yang

Xiangjie Yao

Long Chen

Jun Meng

Guifang Hu

Yaqing He

Zhaojun Duan

Affiliations

Soon will be listed here.

Abstract

Background: Norovirus (NoV) is the main cause of non-bacterial acute gastroenteritis (AGE) outbreaks worldwide. From September 2015 through August 2018, 203 NoV outbreaks involving 2500 cases were reported to the Shenzhen Center for Disease Control and Prevention.

Methods: Faecal specimens for 203 outbreaks were collected and epidemiological data were obtained through the AGE outbreak surveillance system in Shenzhen. Genotypes were determined by sequencing analysis. To gain a better understanding of the evolutionary characteristics of NoV in Shenzhen, molecular evolution and mutations were evaluated based on time-scale evolutionary phylogeny and amino acid mutations.

Results: A total of nine districts reported NoV outbreaks and the reported NoV outbreaks peaked from November to March. Among the 203 NoV outbreaks, 150 were sequenced successfully. Most of these outbreaks were associated with the NoV GII.2[P16] strain (45.3%, 92/203) and occurred in school settings (91.6%, 186/203). The evolutionary rates of the RdRp region and the VP1 sequence were 2.1 × 10 (95% HPD interval, 1.7 × 10-2.5 × 10) substitutions/site/year and 2.7 × 10 (95% HPD interval, 2.4 × 10-3.1 × 10) substitutions/site/year, respectively. The common ancestors of the GII.2[P16] strain from Shenzhen and GII.4 Sydney 2012[P16] diverged from 2011 to 2012. The common ancestors of the GII.2[P16] strain from Shenzhen and previous GII.2[P16] (2010-2012) diverged from 2003 to 2004. The results of amino acid mutations showed 6 amino acid substitutions (*77E, R750K, P845Q, H1310Y, K1546Q, T1549A) were found only in GII.4 Sydney 2012[P16] and the GII.2[P16] recombinant strain.

Conclusions: This study illustrates the molecular epidemiological patterns in Shenzhen, China, from September 2015 to August 2018 and provides evidence that the epidemic trend of GII.2[P16] recombinant strain had weakened and the non-structural proteins of the recombinant strain might have played a more significant role than VP1.

Citing Articles

Biological and immunological characterization of major capsid protein VP1 from distinct GII.2 norovirus clusters.

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Changing predominance of norovirus strains in children with acute gastroenteritis in Shanghai, 2018-2021.

Lu L, Ao Y, Jia R, Zhong H, Liu P, Xu M Virol Sin. 2023; 38(5):671-679.

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