Epidemiological characteristics of varicella in Songjiang Districtï¼ Shanghai from 2013 to 2021
Journal Title: Shanghai Journal of Preventive Medicine - Year 2023, Vol 35, Issue 7
Abstract
ObjectiveTo evaluate the effectiveness of the varicella vaccine immunization strategy in Shanghaiï¼ and to provide evidence for enhancing prevention and control measures by analyzing the incidence and trends of varicella in Songjiang Districtï¼ Shanghai from 2013 to 2021.MethodsA descriptive analysis was conducted on 12 417 varicella cases reported in Songjiang District between 2013 and 2021. The epidemiological distribution of varicella cases was describedï¼ and the incidence rates were compared among different demographic variablesï¼ including registered residenceï¼ genderï¼ ageï¼ and occupation.ResultsA total of 12 417 varicella cases were reported in Songjiang District from 2013 to 2021ï¼with an average annual incidence of 77.03/105. The incidence of varicella showed an increasing trend from 2013 to 2017 ï¼Ï2trend=19.39ï¼ P<0.001ï¼ï¼ followed by a subsequent decrease from 2017 to 2021ï¼Ï2trend=758.62ï¼ P<0.001ï¼. Varicella cases demonstrated significant seasonal variationï¼ with peak incidences occurring in April to May and November to January of the following year. The incidence rate among local residents was higher than that among non-local residents ï¼Ï2=2 935.58ï¼ P<0.001ï¼. Most ï¼38.59%ï¼ of the cases were students aged between 5 and 9 years oldï¼ accounting for 23.45% of the total cases. Howeverï¼ the age distribution of cases varied over the years ï¼Ï2=615.57ï¼ P<0.001ï¼ï¼ and the incidence among children aged 5 to 9 years showed a declining trend since 2017.ConclusionThe overall incidence of varicella in Songjiang District exhibites a declining trend in recent years. Although varicella primarily affects childrenï¼ there have notable changes in the age distribution. Adjustment of the immunization strategy for varicella vaccines in Shanghai effectively reduces the proportion of school-age subjects.
Authors and Affiliations
ZHU Qi,QIAN Jingxian,SHEN Jinhua,CHEN Wenhua,SHEN Jingwen,LU Hongmei,
Keywords
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