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Using the Immunization Information System to determine vaccination coverage rates among children aged 1-7 years: a

Qian Li1, Yu Hu2, Yanpeng Zhong3

  • 1Institute of Immunization and Prevention, Zhejiang Center for Disease Control and Prevention, Hangzhou 310051, China. qianli@cdc.zj.cn.

International Journal of Environmental Research and Public Health
|March 8, 2014
PubMed

Insights

The Zhejiang Immunization Information System (ZJIIS) shows improving National Immunization Program (NIP) vaccine coverage in children aged 1-7 years. However, coverage for vaccines given after 12 months and for migrant children needs improvement.

Area of Science:

  • Public Health
  • Epidemiology
  • Vaccinology

Background:

  • The Zhejiang Immunization Information System (ZJIIS) was established in 2004 to monitor vaccine administration.
  • This study analyzes National Immunization Program (NIP) vaccine coverage in Zhejiang Province using ZJIIS data.

Purpose of the Study:

  • To describe NIP vaccine coverage rates in children aged 1-7 years in Zhejiang Province.
  • To identify trends, patterns, and disparities in vaccine administration using cohort data.

Main Methods:

  • A cohort of 3,579,896 children (born 2005-2011) registered in ZJIIS was analyzed.
  • Immunization records were obtained as of December 31, 2012.
  • Coverage was assessed by vaccine, age group, birth cohort, immigration status, and geography, including timeliness for the 2010 birth cohort.

Main Results:

  • Vaccine coverage for doses scheduled at ≤12 months exceeded 90%.
  • Coverage decreased significantly for vaccines scheduled after 12 months, falling below 90%.
  • Migrant children and those in WenZhou, Zhoushan, and TaiZhou municipalities showed lower coverage. Delays in primary series vaccination were noted, particularly among migrant children in the 2010 birth cohort.

Conclusions:

  • ZJIIS is effective for tracking vaccine coverage and demonstrates improving NIP delivery in Zhejiang.
  • Identified disparities highlight areas needing targeted interventions to enhance vaccine uptake.
  • Continued surveillance via ZJIIS and implementation of strategies like reminder/recall and school-based programs are recommended.
Abstract

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