南加里福尼亚医学校447名学生中,132名罹143次的血液感染,多为意外针刺引起。发生在三年级者占69％,较四年级者更为普遍,针剌感染高峰在学年开始时(7—10月份)。122例患者中有9例HBsAg阳性,(占7％); 2名HBeAg阳性,为具有HBV感染性较强的标志。有9名学生接触过HBsAg阳性病人的血液,其中4名接受过乙肝免疫血清球蛋白; Of the 447 students in Southern California Medical School, 132 suffered from bloodstream infections 143 times and were mostly caused by accidental acupuncture. Occurring in the third grade accounted for 69%, more generally than the fourth grade, acupuncture infection peak at the beginning of the school year (July-October). Of the 122 patients, 9 were HBsAg-positive (7%); 2 were HBeAg-positive and were markers of HBV infectivity. Nine students had been exposed to HBsAg-positive blood, of whom four had hepatitis B immune serum globulin;