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Human T-lymphotropic virus type II in Japan

H Yoshizaki1, K Kitamura, A Oki

  • 1Laboratory of Immunology, AIDS Research Center, National Institute of Health, Tokyo.

Japanese Journal of Cancer Research : Gann
|January 1, 1996
PubMed
Summary
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This study identified the first case of human T-lymphotropic virus type II (HTLV-II) infection in Japan among blood donors. Despite screening 1,500 HTLV-I positive individuals, only one blood donor tested positive for HTLV-IIb.

Area of Science:

  • Virology
  • Epidemiology
  • Public Health

Background:

  • Human T-lymphotropic virus type II (HTLV-II) is a retrovirus with a global distribution.
  • Previous studies have not confirmed the presence of HTLV-II in Japan.
  • Understanding the prevalence and origin of HTLV-II is crucial for public health strategies.

Purpose of the Study:

  • To investigate the presence of HTLV-II infection in Japan.
  • To identify the specific subtype of HTLV-II if detected.
  • To explore the potential origin of HTLV-II in the identified case.

Main Methods:

  • Serum specimens from 1,500 individuals with known human T-lymphotropic virus type I (HTLV-I) seropositivity were tested for HTLV-II.
  • An additional 30,000 blood donors in Japan were screened for HTLV-II.

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  • Positive samples were further analyzed to determine the HTLV-II subtype.

    • Main Results:

    • None of the 1,500 HTLV-I positive individuals tested positive for HTLV-II.
    • One individual among the 30,000 blood donors screened was clearly seropositive for HTLV-II.
    • This individual was confirmed to be positive for the HTLV-IIb subtype.

    Conclusions:

    • This study reports the first confirmed case of HTLV-II infection in Japan.
    • The findings highlight the importance of continued surveillance for HTLV-II, even in regions where it was previously considered absent.
    • Further research is needed to understand the transmission dynamics and origin of HTLV-II in Japan.