Performance of adverse events following immunization surveillance system in Karamay, Xinjiang, 2010-2013

Objective To understand the incidence of adverse events following immunization (AEFI) in Karamay and evaluate the performance of AEFI surveillance system. Methods Descriptive epidemiological analysis was conducted on the incidence data of AEFI reported in Karamay during 2010-2013. Results A total of 124 AEFI cases were reported during this period, the cases were reported in all 4 districts, and the cases in Karamay district accounted for 75.00%. Compared with 2010, the AEFI cases reported in 2013 increased substantially, the male to female ratio was 1.43:1. The overall incidence of AEFI ranged from 4.47/lakh to 36.96/lakh; The cases in age grouP1 year accounted for 54.03% of the total (67/124), and less cases occurred in older age group. Most cases (83.87%) occurred within 1 day after vaccination, and the cases were mainly reported in May, June and September, accounting for 42.75% (53/124). Fourteen kinds of vaccines were involved, but the AEFI caused by DTP accounted highest proportion (26.62%); Most AEFI were mild reaction, accounting for 98.40% (122/124), and fever, swelling and induration were recorded in 90 cases, accounting for 72.58%. Conclusion The completeness, sensitivity and timeliness of AEFI surveillance has been improved in Karamay, but more efforts are needed for the further improvement of the surveillance system.