Epidemiological analysis of breakthrough cases in varicella outbreak during 2007-2023 in Fengxian District of Shanghai
10.13200/j.cnki.cjb.004505
- VernacularTitle:2007—2023年上海市奉贤区水痘突破病例流行病学特征分析
- Author:
LI Ruiping
- Publication Type:Journal Article
- Keywords:
Varicella;
Varicella vaccine;
Breakthrough varicella cases;
Immunization program;
Epidemiological characteristics
- From:
Chinese Journal of Biologicals
2025;38(06):685-690
- CountryChina
- Language:Chinese
-
Abstract:
Objective To analyze the epidemiological characteristics of breakthrough varicella cases in Fengxian District of Shanghai from 2007 to 2023,so as to provide a reference for the effective prevention and control of varicella epidemic.Methods The reported cases of varicella in Fengxian District of Shanghai from 2007 to 2023 were collected by China Information System for Diseases Control and Prevention.The immunization history information of varicella cases was obtained from Shanghai Immunization Program Information System and analyzed by descriptive epidemiological methods.Results A total of 2 175 breakthrough varicella cases were reported in Fengxian District of Shanghai from 2007 to 2023.The proportion of breakthrough cases in each year was from 0.64% to 36.29% with statistically significant difference(χ~2=1 144.60,P <0.01).The varicella breakthrough cases were mainly concentrated in the 3-11 age group,and the primary cases were concentrated in the 5-11 and 15-20 age groups,with breakthrough cases skewed towards younger ages.The varicella breakthrough cases were predominantly preschool children and lower-grade students,while primary cases were more common among lower-grade students and university students,displaying a statistically significant difference(χ~2=242.89,P <0.01).The incidence of varicella showed a peak during the winter season,and the highest incidence of varicella breakthrough cases occurred in 3-7 years after vaccination.Since the adjustment of varicella vaccination program in 2017,the incidence of varicella among children aged 1-6 years showed a downward trend(R=-0.009,P=0.000).Conclusion From 2007 to 2023,the proportion of varicella breakthrough cases in Fengxian District of Shanghai showed a consistent increasing trend.The continuous monitoring of varicella and publicity should be strengthened in schools and kindergartens.It is of substantial significance to strengthen immunization three years after the first dose of vaccine.The adjustment of varicella immunization program has achieved remarkable results.
