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作者在12个月期间对美国两个州的各1群所登记的确诊为急性乙型和丙型病毒性肝炎患者做了调查。调查方法为家访,探求其发病前6个月内所接触的已知与此两型肝炎传播有关的危险因子(输血、静脉吸毒等)和其它的可能传播因子,包括与家庭成员的日常接触与性生活,同时还为每1例无明显传染源的患者随机挑选了当地1名与之在年龄、性别、种族等方面相匹配的健康(血清转氨酶水平正常)居民作为对照。
The authors conducted a survey over 12 months in each of the first two U.S. states registered for the diagnosis of acute hepatitis B and C hepatitis. The survey was conducted on a home visit to investigate the risk factors (transfusion, intravenous drug use, etc.) known to be associated with the spread of these two types of hepatitis during the six months prior to their onset and other possible transmission factors including daily contact with family members and Sexually transmitted infections were also randomly selected for each of the 1 patients who did not have a significant source of infection. One healthy local population with normal serum aminotransferase levels matched for age, sex and ethnicity were selected as controls.