The sera of 5,684 pregnant women were tested for HBsAG and 432 (7.6%) were found positive. Positive HBsAG sera were then tested for the e antigen and of 413 tested, 115 or 27.8% were positive. The over-all prevalence rate of e antigen was 2.03%. All women were asymptomatic. Six of 13 HBsAG-HBeAg-positive mothers delivered infants who became HBsAg-positive within two years of age for a rate of 46%. The findings support earlier studies on the importance of the e antigen as an index of perinatal transmission. Also, they support evidence of unusually high rates of transmission among Asian ethnic groups.
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