患儿男,1991年6月6日出生,1999年12月8日下午2时在学校于右上臂三角肌附着处皮下接种冻干麻疹活疫苗(北京生物制品研究所生产,批号为990424—3,失效期为2000.11),接种剂量为0.2ml,当晚双下肢发痒,第二天早上发现双下肢脚腕出现瘀点,继而成瘀斑,开始呈暗红色,后转为暗紫色。当时用年尔敏治疗,效果不明显,第三天早上双手腕部也有同样瘀斑。到县医院、防疫站查体:患儿精神较好,无发热, Children born in June 6, 1991, at 8 o’clock on the December 8, 1999 at 2 o’clock in the school at the attachment of the right upper quadrant deltoid vaccination freeze-dried measles vaccine (Beijing Institute of Biological Products, batch number 990424-3, The expiry date was 2000.11). The inoculation dose was 0.2ml. The lower limbs were itchy in the evening. The next morning, the lower limbs were found to have petechia and then ecchymosis, which turned dark red and turned dark purple. Alzheimer’s treatment was used at that time, the effect is not obvious, the third day morning both hands have the same ecchymosis. To the county hospital, epidemic prevention station examination: children with better spirit, no fever,