Analysis of epidemiological characteristics of varicella,Binhu District,Wuxi City,2017-2022
Objective This study was aimed at understanding the incidence and epidemiological characteristics of varicella in Binhu District,Wuxi City,to provide a scientific basis for adjusting varicella epidemic prevention and control strategies,and guiding varicella vaccination.Methods A descriptive epidemiological method was used to analyze data for varicella cases and varicella vaccine immunization history in Binhu District,Wuxi City from 2017 to 2022.Results A total of 4 581 cases of varicella were reported in Binhu District,Wuxi City from 2017 to 2022.The average annual reported inci-dence rate was 143.46/105,indicating a decreasing trend overall.The peak of the epidemic was from November to January and from May to July.The top four areas with the highest incidence were Lihu,Helie,Liyuan,and Rongxiang streets in the main urban area.The age of onset was primarily 0-19 years.The proportion of patients 0-9 years of age decreased from 55.18％in 2017 to 24.02％in 2022,whereas the proportion of patients 10-19 years of age increased from 24.51％in 2017 to 35.74％in 2022.The main groups affected were students,young children in kindergarten,and scattered children,accounting for 76.40％.The vaccination rates for the first and second doses of varicella vaccine in children 1-6 years of age have in-creased each year.Among varicella cases in children 0-9 years old,breakthrough cases accounted for 25.56％;94.56％of breakthrough cases received only one dose of vaccine,and 70.49％had an interval between vaccination and onset ≥3 years.Conclusions Schools and kindergartens remain important areas for varicella epidemic prevention and control.Greater at-tention must be paid to incidence and prevention among students 10-19 years of age.Emergency varicella vaccination in the free scope and expanding the free vaccination age of varicella vaccine when appropriate are recommended.
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