Influenza surveillance among children in Songjiang District of Shanghai, 2014-2018
10.19428/j.cnki.sjpm.2021.19612
- VernacularTitle:2014—2018年上海市松江区儿童流行性感冒流行特征分析
- Author:
Xia-jing YAO
1
;
Qing-hui ZHANG
;
Jia-jin WU
;
Ling LIU
;
Yuan-yuan KONG
Author Information
1. Songjiang District Center for Disease Control and Prevention, Shanghai 201620, China
- Publication Type:Research Article
- Keywords:
epidemiology;
influenza-like illness;
surveillance;
etiology
- From:
Shanghai Journal of Preventive Medicine
2021;33(1):56-
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the epidemiological characteristics of influenza in Songjiang District, Shanghai during 2014-2018, and to provide scientific evidence for the prevention of influenza. Methods We collected the data including influenza-like illness(ILI)report, etiological examination and influenza outbreak in Songjiang, and further characterized the epidemic of influenza using descriptive statistics. Results Data from the sentinel hospital-based surveillance system showed two peaks of influenza incidence in winter and summer in Songjiang, in which the winter peak was more significant. The largest proportion of ILI was the age group 0-4 years(57.90%). The proportion of being positive for influenza nucleic acid was 18.44%. All principal types of influenza were prevalent in Songjiang with a certain pattern of alternative circulation, in which influenza B virus accounted for 41.18% among all the types, followed by seasonal H3(36.95%)and H1N1(21.98%). A total of 650 influenza strains were isolated. The total proportion of isolation was 67.08%, which fluctuated by year with a peak of 79.37% in 2016. Of all the 27 outbreaks of influenza, 88.89% of them were identified in primary and middle schools and 70.37% occurred in December. Conclusion Different subtypes of influenza viruses were prevalent alternatively in Songjiang during 2014-2018. The etiological results and influenza outbreaks are generally in consistent with ILI report. It warrants necessary prevention in primary and middle schools in epidemic seasons of influenza.
