OCCUPATION AND HEALTH ›› 2025, Vol. 41 ›› Issue (24): 3419-3422.

• Investigation and Research • Previous Articles     Next Articles

Surveillance and analysis of adverse events following immunization in Tianjin from 2023 to 2024

ZHU Di, LUO Xiaoyan(), LI Yongcheng, GUO Baihui   

  1. Institute of ImmunizationTianjin Centers for Disease Control and PreventionTianjin 300011, China
  • Received:2025-10-24 Revised:2025-11-01 Online:2025-12-15 Published:2026-01-22
  • Contact: LUO Xiaoyan,Associate chief physician,E-mail:luoxiaoyan1999@126.com

Abstract:

Objective To analyze the surveillance data of adverse events following immunization(AEFI) in Tianjin from 2023 to 2024,and to provide scientific guidance for improving the precision and effectiveness of regional AEFI monitoring and management. Methods Based on the Tianjin Immunization Planning Information Management System and the AEFI monitoring system of the Chinese Immunization Information Management System,data on vaccination and AEFI reports in Tianjin from 2023 to 2024 were collected. Descriptive epidemiological methods were used to analyze the AEFI monitoring data. Results The reported incidence rate of AEFI in Tianjin from 2023 to 2024 was 29.07 per 100 000 doses. The reported incidence rates of general reactions and abnormal reactions were 26.95 per 100 000 doses and 1.11 per 100 000 doses,respectively. The majority of reported cases occurred in individuals aged ≤1 year(63.76%),with a higher proportion in males(51.78%). The highest AEFI reported incidence rate was observed in the second quarter(34.04 per 100 000 doses). Japanese encephalitis inactivated vaccine(JE-I),recombinant zoster vaccine(RZV),and group A,C,Y and W135 meningococcal polysaccharide conjugate vaccine(MPCV-ACYW) had the top three highest total AEFI reported incidence rates. The most common general reactions were fever,local redness/swelling,and local induration,with reported incidence rates of 15.38 per 100 000 doses,9.00 per 100 000 doses,and 3.50 per 100 000 doses,respectively. The predominant abnormal reaction was allergic rash,with a reported incidence rate of 0.54 per 100 000 doses. Most adverse reactions occurred within 0-1 day after vaccination. Conclusion In Tianjin,AEFI cases reported were primarily general reactions,with abnormal reactions remaining at a low level. Standardized AEFI surveillance and reporting should be continued to improve monitoring sensitivity.

Key words: Vaccination, Adverse events following immunization, Surveillance analysis, Reported incidence rate, Vaccine

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