Objective To understand the cause for the increase of sterile abscess cases upon DPT(whole cell) vaccination in 2005 in Beijing,so as to control the AEFI rate and improve vaccination safety.

• 目的了解北京市2005年接种吸附百白破联合疫苗(DPT)后无菌化脓病例增多的原因,保证安全接种。