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1979年3月至8月,某医院传染病科医生发现有3例急性乙型肝炎病人不久前曾在该院作过妇产科手术。为确定其传染来源,遂对该院妇产科人员进行了流行病学调查和实
From March to August 1979, a hospital infectious disease doctor found three acute hepatitis B patients who had undergone obstetrics and gynecology operations in the hospital not long ago. To determine the source of infection, then the hospital obstetrics and gynecology staff conducted an epidemiological survey and practice