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© 1987 Oxford University Press

research-article

Time Trends of the Prevalences of Hepatitis B e Antigen Positives among Hepatitis B Virus Carriers in Japan

HIDEAKI TSUKUMA*, AKIRA OSHIMA**, TOMOHIKO HIYAMA*, ISABURO FUJIMOTO*, HAJIME YAMANO{dagger} and MASAYOSHI TANAKA{dagger}

* Department of Field Research, Centre for Adult Diseases Nakamichi 1-3-3, Higashinari-ku, Osaka, Japan
** Research Institute, the Centre for Adult Diseases Osaka
{dagger} Osaka Red Cross Blood Centre

In order to examine time trends of the prevalences of HBeAg positives among HBV carriers in Japan, we analysed data on HBeAg of HBsAg positive voluntary blood donors (23 560 males, and 8659 females) at the Osaka Red Cross Blood Centre between January 1977 and March 1984. Age-specific prevalences of HBeAg positives decreased year by year for both sexes, especially for those in their teens and twenties. The prevalences of HBeAg positives decreased with age, but at any given age it was lower for the later than for the earlier birth cohorts. Although reasons for the secular declines are unknown, the findings suggest that the prevalence of HBeAg positives among HBV carriers will continue to decrease in Japan. This, together with the immunization programme implemented this year, may lead to a future reduction in the risk of HBV related liver diseases in Japan.

Received 1 October 1986


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