After A group hemolytic streptococcus absorbed blood serum of HRA,the adsorbing rate of rheumatic heart disease group was 75. 0% (21/28);

• HRA阳性血清经A组溶血性链球菌膜抗原吸附后；风湿性心脏病吸附阳性率75.；0%25(21/28);