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An Evaluation of Voluntary Varicella Vaccination Coverage in Zhejiang Province, East China

Author

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  • Yu Hu

    (Institute of Immunization and Prevention, Zhejiang Provincial Center for Disease Control and Prevention, Hangzhou 310051, China)

  • Yaping Chen

    (Institute of Immunization and Prevention, Zhejiang Provincial Center for Disease Control and Prevention, Hangzhou 310051, China)

  • Bing Zhang

    (Institute of Immunization and Prevention, Zhejiang Provincial Center for Disease Control and Prevention, Hangzhou 310051, China)

  • Qian Li

    (Institute of Immunization and Prevention, Zhejiang Provincial Center for Disease Control and Prevention, Hangzhou 310051, China)

Abstract

Background : In 2014 a 2-doses varicella vaccine (VarV) schedule was recommended by the Zhejiang Provincial Center for Disease Control and Prevention. We aimed to assess the coverage of the 1st dose of VarV (VarV 1 ) and the 2nd dose of VarV (VarV 2 ) among children aged 2–6 years through the Zhejiang Provincial Immunization Information System (ZJIIS) and to explore the determinants associated with the VarV coverage. Methods : Children aged 2–6 years (born from 1 January 2009 to 31 December 2013) registered in ZJIIS were enrolled. Anonymized individual records of target children were extracted from the ZJIIS database on 1 January 2016, including their VarV and (measles-containing vaccine) MCV vaccination information. The VarV 1 and VarV 2 coverage rates were evaluated for each birth cohorts. The coverage of VarV also was estimated among strata defined by cities, gender and immigration status. We also evaluated the difference in coverage between VarV and MCV. Results : A total of 3,028,222 children aged 2–6 years were enrolled. The coverage of VarV 1 ranged from 84.8% to 87.9% in the 2009–2013 birth cohorts, while the coverage of VarV 2 increased from 31.8% for the 2009 birth cohort to 48.7% for the 2011 birth cohort. Higher coverage rates for both VarV 1 and VarV 2 were observed among resident children in relevant birth cohorts. The coverage rates of VarV 1 and VarV 2 were lower than those for the 1st and 2nd dose of MCV, which were above 95%. The proportion of children who were vaccinated with VarV 1 at the recommended age increased from 34.6% for the 2009 birth cohort to 75.2% for the 2013 birth cohort, while the proportion of children who were vaccinated with VarV 2 at the recommended age increased from 19.7% for the 2009 birth cohort to 48.7% for the 2011 birth cohort. Conclusions : Our study showed a rapid increasing VarV 2 coverage of children, indicating a growing acceptance of the 2-doses VarV schedule among children’s caregivers and physicians after the new recommendation released. We highlighted the necessity for a 2-doses VarV vaccination school-entry requirement to achieve the high coverage of >90% and to eliminate disparities in coverage among sub-populations. We also recommended continuous monitoring of the VarV coverage via ZJIIS over time.

Suggested Citation

  • Yu Hu & Yaping Chen & Bing Zhang & Qian Li, 2016. "An Evaluation of Voluntary Varicella Vaccination Coverage in Zhejiang Province, East China," IJERPH, MDPI, vol. 13(6), pages 1-10, June.
    • Handle: RePEc:gam:jijerp:v:13:y:2016:i:6:p:560-:d:71409
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    References listed on IDEAS

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    1. Yu Hu & Qian Li & Enfu Chen & Yaping Chen & Xiaohua Qi, 2013. "Determinants of Childhood Immunization Uptake among Socio-Economically Disadvantaged Migrants in East China," IJERPH, MDPI, vol. 10(7), pages 1-12, July.
    2. Qian Li & Yu Hu & Yanpeng Zhong & Yaping Chen & Xuewen Tang & Jing Guo & Lingzhi Shen, 2014. "Using the Immunization Information System to Determine Vaccination Coverage Rates among Children Aged 1–7 Years: A Report from Zhejiang Province, China," IJERPH, MDPI, vol. 11(3), pages 1-16, March.
    3. Averhoff, F. & Linton, L. & Peddecord, K.M. & Edwards, C. & Wang, W. & Fishbein, D., 2004. "A middle school immunization law rapidly and substantially increases immunization coverage among adolescents," American Journal of Public Health, American Public Health Association, vol. 94(6), pages 978-984.
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    Cited by:

    1. Yu Hu & Yaping Chen & Ying Wang & Hui Liang, 2017. "Knowledge, Attitude and Practice of Pregnant Women towards Varicella and Their Children’s Varicella Vaccination: Evidence from Three Distrcits in Zhejiang Province, China," IJERPH, MDPI, vol. 14(10), pages 1-10, September.
    2. Yu Hu & Xinpei Zhang & Qian Li & Yaping Chen, 2016. "Auditing the Immunization Data Quality from Routine Reports in Shangyu District, East China," IJERPH, MDPI, vol. 13(11), pages 1-11, November.
    3. Yu Hu & Qian Li & Yaping Chen, 2017. "Timeliness of Childhood Primary Immunization and Risk Factors Related with Delays: Evidence from the 2014 Zhejiang Provincial Vaccination Coverage Survey," IJERPH, MDPI, vol. 14(9), pages 1-13, September.
    4. Yu Hu & Yaping Chen, 2017. "Evaluating Childhood Vaccination Coverage of NIP Vaccines: Coverage Survey versus Zhejiang Provincial Immunization Information System," IJERPH, MDPI, vol. 14(7), pages 1-8, July.

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