2013年4月浙江省德清县某预防接种门诊报告1例接种吸附无细胞百白破-灭活脊髓灰质炎-b型流感嗜血杆菌联合疫苗(Absorbed DiphtheriaTetanus-Acellular Pertussis-Inactivated PoliomyelitisHaemophilus Influenzae Type b Combined Vaccine,DTa P-IPV-Hib)后出现特发性血小板减少性紫癜(Idiopathic Thrombocytopenic Purpura,ITP)疑似预防接种异常反应(Adverse Events Following Immunization,AEFI)病例,经当地预防接种异常反应调查诊断专家组诊断,确定该病例与接种疫苗无因果关联,