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American Journal of Epidemiology Vol. 128, No. 5: 1153-1161
Copyright © 1988 by The Johns Hopkins University School of Hygiene and Public Health

research-article

INFECTIOUS STATES OF HUMAN T LYMPHOTROPIC VIRUS TYPE I AND HEPATITIS B VIRUS AMONG JAPANESE IMMIGRANTS IN THE REPUBLIC OF BOLIVIA

SHOICHIRO TSUGANE1,, SHAW WATANABE1, HARUHIKO SUGIMURA1, TOMOKO OTSU2, KENSEI TOBINAI2, MASANORI SHIMOYAMA2, SEHCHIRO NANRI3 and HIROMASA ISHII4

1Epidemiology Division, National Cancer Center Research Institute 5–1–1 Tokyo, 104, Japan
2Hematology-Oncology and Clinical Cancer Chemotherapy Division, National Cancer Center Hospital Tokyo, Japan
3Health Administration Center, Keio University Kanagawa, Japan
4Department of Internal Medicine, School of Medicine, Keio University Tokyo, Japan

Reprint requests to Dr. Shoichiro Tsugane, Epidemiology Division, National Cancer Center Research Institute, 5–1–1, Tsukiji, Chuo-ku, Tokyo, 104, Japan

Serologic tests for human T lymphotropic virus type I (HTLV-I) and hepatitis B virus infections were conducted in 1986 in two Japanese immigrant colonies located in Santa Cruz, Bolivia. A total of 322 adults (283 Japanese and 39 Bolivians) over age 35 years and 305 children (166 Japanese, 124 Bolivians, and 15 of mixed blood) aged 8–17 years were sampled at the time of a routine health checkup. The prevalence of antibody to HTLV-I was 17% In first-generation Japanese immigrants and 6% in second- or third-generation Japanese children. Prevalences among native Bolivians were 3% and 5% in adults and children, respectively. Seropositive Japanese immigrants and mothers showed clustering according to birthplace in endemic areas of Japan. The prevalence of either hepatitis B virus surface antigen (HBsAg) or antibody to HBsAg was 48% in Japanese adults, 21% in Japanese children, 13% in Bolivian adults, and 1% in Bolivian children. Seropositive adults did not show clustering according to birth place, but children in one colony showed clustering and a narrow age range. A correlation of seropositivity between husbands and wives was found only for HTLV-I. The seropositivity was independent of whether an HTLV-I or a hepatitis B virus infection marker was present.

ethnic groups; hepatitis B virus; human T-cell leukemia virus; transients; migrants


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