疑似预防接种异常反应(adverse events following immunization,AEFI)是指在预防接种过程中或接种后发生的可能造成受种者机体的组织器官或功能损害,且怀疑与预防接种有关的反应。随着免疫规划工作的发展,特别是近年来扩大国家免疫规划的全面推行,目前使用疫苗的种类和数量不断增加,AEFI也受到越来越广泛的关注。开展AEFI监测,对于评价疫 Adverse events following immunization (AEFI) refers to reactions that occur during or after vaccination, that may cause damage to the tissues and organs of the recipient’s organism or function and are suspected of being associated with vaccination. With the development of immunization programs, and in particular the expansion of the national immunization program in recent years, the variety and number of vaccines currently in use have been increasing. AEFI is also receiving more and more attention. Carry out AEFI monitoring for the evaluation of epidemics