Immunization Information Systems (IIS) are computerized population-based systems with individual-level vaccination-related information used to help ensure protection from vaccine preventable diseases. The Chinese Center for Diseases Control and Prevention (China CDC) conducted a survey of the 32 mainland China provincial CDCs to determine IIS coverage and implementation of key functions: individual vaccination records, vaccine management, cold-chain management, and school entry vaccination status verification. Twenty-seven IISs collectively managed 252 million immunization records, 43.8% for children under 6 years; 20 could exchange records with other IISs. The within-province duplicate-record rate varied from 0.3% to 4.0%, but compared with National Statistical Bureau's census estimates, 138.0% of births from 2012 to 2017 were represented in the IISs, implying significant across-province record duplication. China CDC should consider developing a national-level IIS center for data exchange and analysis.
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