Investigation and analysis on an outbreak of norovirus infection in a health school in Guangdong Province, China.

Autor: Xu Y; Futian District Center for Disease Control and Prevention, Shenzhen, People's Republic of China; Guangdong Field Epidemiology Training Program, Guangzhou, People's Republic of China., Zhu Y; State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, School of Public Health, Xiamen University, Xiamen City 361102, Fujian Province, People's Republic of China., Lei Z; State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, School of Public Health, Xiamen University, Xiamen City 361102, Fujian Province, People's Republic of China., Rui J; State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, School of Public Health, Xiamen University, Xiamen City 361102, Fujian Province, People's Republic of China., Zhao Z; State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, School of Public Health, Xiamen University, Xiamen City 361102, Fujian Province, People's Republic of China., Lin S; State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, School of Public Health, Xiamen University, Xiamen City 361102, Fujian Province, People's Republic of China., Wang Y; State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, School of Public Health, Xiamen University, Xiamen City 361102, Fujian Province, People's Republic of China., Xu J; State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, School of Public Health, Xiamen University, Xiamen City 361102, Fujian Province, People's Republic of China., Liu X; State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, School of Public Health, Xiamen University, Xiamen City 361102, Fujian Province, People's Republic of China., Yang M; State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, School of Public Health, Xiamen University, Xiamen City 361102, Fujian Province, People's Republic of China., Chen H; Guangdong Provincial Center for Disease Control and Prevention, Guangzhou, People's Republic of China., Pan X; Lianzhou District Center for Disease Control and Prevention, Qingyuan, People's Republic of China., Lu W; Qingyuan City Center for Disease Control and Prevention, Qingyuan, People's Republic of China., Du Y; Qingyuan City Center for Disease Control and Prevention, Qingyuan, People's Republic of China., Li H; Guangdong Provincial Center for Disease Control and Prevention, Guangzhou, People's Republic of China., Fang L; Guangdong Provincial Center for Disease Control and Prevention, Guangzhou, People's Republic of China., Zhang M; Guangdong Provincial Center for Disease Control and Prevention, Guangzhou, People's Republic of China., Zhou L; Department of Nephrology, The second Hospital of Xiamen Medical college, Xiamen 361021, China., Yang F; Guangdong Provincial Center for Disease Control and Prevention, Guangzhou, People's Republic of China. Electronic address: 492242163@qq.com., Chen T; State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, School of Public Health, Xiamen University, Xiamen City 361102, Fujian Province, People's Republic of China. Electronic address: chentianmu@xmu.edu.cn.
Jazyk: angličtina
Zdroj: Infection, genetics and evolution : journal of molecular epidemiology and evolutionary genetics in infectious diseases [Infect Genet Evol] 2021 Dec; Vol. 96, pp. 105135. Date of Electronic Publication: 2021 Nov 12.
DOI: 10.1016/j.meegid.2021.105135
Abstrakt: Our objective was to describe the epidemiological features of an outbreak of norovirus infection in a health school in Guangdong province, China, to identify the cause of such a large scale outbreak of norovirus among older students, to simulate the transmission dynamics, and to evaluate the effect of intervention measures of GII.17 [P17] genotype norovirus infection. We identified all cases during the outbreak. Descriptive epidemiological, analytical epidemiological and hygiene survey methods were used to described the outbreak epidemic course and identify the cause of the outbreak of norovirus infection. We also used dynamical model to simulate the transmission dynamics of norovirus infection and evaluate the effect of intervention measures. Norovirus genotyping was assigned to the newly obtained strains, with a maximum likelihood phylogenetic analysis conducted. There were 360 cases of 42 classes in five grades with a 12.99% attack rate. Proportionally, more students were in contact with sick students and vomit in the suspected case group than the control group (χ 2  = 5.535, P = 0.019 and χ 2  = 5.549, P = 0.019, respectively). The basic reproduction number was 8.32 before and 0.49 after the intervention. Dynamical modeling showed that if the isolation rate was higher or case isolation began earlier, the total attack rate would decrease. Molecular characterization identified the GII.17 [P17] genotype in all stains obtained from the health school, which were clustered with high support in the phylogenetic tree. This was an outbreak of norovirus infection caused by contact transmission. The main reasons for the spread of the epidemic were the later control time, irregular treatment of vomit and no case isolation. The transmission dynamics of contact transmission was high, more efficient control measures should be employed.
(Copyright © 2021. Published by Elsevier B.V.)
Databáze: MEDLINE
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