ArticleEpidemiology and infection2023
Impact of implementing a free varicella vaccination policy on incidence in Wuxi City, China: an interrupted time series analysis.
Article in Epidemiology and infection, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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Who cites it
5 citing papers in PubMed.
- Impact of immunization strategies, public health and social measures on the incidence of varicella among children aged 0-14 years in Quzhou City.Human vaccines & immunotherapeutics · 2026Article
- The Impact and Effectiveness of a Two-Dose Varicella Immunization Program Among School Children: Evidence from Quasi-experimental Analyses.Infectious diseases and therapy · 2026Article
- The effect of mumps vaccine on the incidence of mumps in Hefei: An interrupted time-series analysis.Human vaccines & immunotherapeutics · 2025Article
- Vaccination coverage, willingness and determinants of herpes zoster vaccine among individuals aged 50 and above in Ningbo, China: A population-based cross-sectional study.Human vaccines & immunotherapeutics · 2025Article
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5 authors.
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Abstract
Varicella vaccination is optional and requires self-payment. On 1 December 2018, Wuxi City launched a free varicella vaccination program for children. This study aimed to evaluate the changes in varicella incidence before and after the implementation of the policy. The data were obtained from official information systems and statistical yearbooks. We divided the period into chargeable (January 2017 to November 2018) and free (December 2018 to December 2021) periods. Interrupt time series analysis was used to conduct a generalised least-squares regression analysis for the two periods. A total of 51,071 varicella cases were reported between January 2017 and December 2021. After the implementation of the policy, there was a statistically significant decrease in the incidence of varicella (β2 = -0.140, P = 0.017), and the slope of the incidence also decreased by 0.012 (P = 0.015). Following policy implementation, the incidence decreased in all age groups, with the largest decline observed among children aged 8-14 years (β2 = -1.109, P = 0.009), followed by children aged ≤7 years (β2 = -0.894, P = 0.013). Our study found a significant reduction in the incidence of varicella in the total population after the introduction of free varicella vaccination in Wuxi City.
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