Soyano A, Malavé I, Walder R, Layrisse Z, Layrisse M
Rev Bras Pesqui Med Biol. 1976 Dec;9(5-6):247-53.
A high frequency of Hepatitis-B antigen (7%) was found in apparently healthy Yanomama indians living in southern Venezuela. The prevalence in 24 different Yanomama villages varied between 0 and 30%, but only 3 of 938 serum samples showed presence of HB-Ab. The distribution of the HB-Ag was found to be significantly higher in males than in females.