Epidemiological characteristics of varicella in Xindu District,Chengdu from 2010 to 2023
Objective To analyze the incidence and epidemiological characteristics of varicella in Xindu District of Chengdu,and to provide evidence for improving the prevention and control strategy of varicella.Methods The incidence time,age,sex and residence area of varicella cases with onset date from 2010 to 2023 and current address in Xindu District in the Chinese Disease Prevention and Control Information System were analyzed.Rate comparison and trend analysis were performed by SPSS 27.0 for x2 test,and the test level was α=0.05.Results There were 7 352 cases of varicella reported in Xindu District from 2010 to 2023,with an incidence rate of 4.17/105.The incidence rate from 2010 to 2023 were 6.98/105,5.11/105,4.74/105,5.74/105,3.86/105,5.82/105,3.58/105,4.31/105,5.17/105,4.16/105,2.79/105,3.00/105,2.99/105 and 3.12/105,respectively.And the incidence rates were statistically different among the years(x2=574.434,P＜0.001).The incidence was 4.53/105 in males and 3.8/105 in females,and the difference between males and females was statistically significant(x2=57.526,P＜0.001).The incidence rate of each age group was 20.86/105 in 0-5 years old group,22.12/105 in 6-11 years old group,14.85/105 in 12-17 years old group,6.88/105 in 18-23 years old group,2.31/105 in 24-29 years old group,1.18/105 in 30-35 years old group,0.47/105 in 36-41 years old group,and 0.04/105 in 42 years and above group.The median age of onset from 2010 to 2023 was 5,5,5,6,6,7,8,8,9,10,12,14,14 and 15 years old,respectively(x2=884.135,P＜0.001).There were two peaks in the whole year,from May to July and from October to December.Cases were reported in all townships/streets,and the incidence rate was correlated with population density(R2=0.591,P=0.026,a=2.612,b=0.139).Conclusions From 2010 to 2023,the incidence of varicella in Xindu District of Chengdu decreased year by year,but the median age of onset increased year by year.
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