Several reports have shown that the frequency of HB Ag-positive acute viral hepatitis infections is increased in young adults with no history of parenteral exposure (Prince, Hargrove, Szmuness, Cherubin, Fontana, and Jeffries, 1970; Papaevangelou, Kourea, and Tsoukas, 1971; Fulford, Dane, Catterall, Woof, and Denning, 1973). A high frequency of HB Ag-positive hepatitis cases was also found among homosexuals (Vahrman, 1973) and evidence has been presented that hepatitis B may spread between sexual partners (Hersh, Melnick, Goyal, and Hollinger, 1971).
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Papaevangelou et al. (1974) studied this question.
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