Epidemiological Characteristics of Varicella in Anhui Province, China, 2012-2021: Surveillance Study.

Overall, there was an increasing trend of varicella incidence between 2012 and 2019, followed by a decline in 2020 and a slight rebound in 2021.

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The proportion of male cases among the total number of new annual cases showed a decreasing trend over the decade, whereas the number of female cases gradually increased ( χ 2 1 =269.18, P for trend <.001); the overall sex ratio of cases was approximately 1.26.

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