Abstract
In Latin America, the prevalence of HTLV-I is decreasing and at present is not as high (up to 10%; ref. 10) as reported previously. The same phenomenon can be seen in an endemic island in Japan that had a high prevalence of HTLV-I in 1985 (23% in 2,582 adults from 2−50% among 123 villages; ref. 11) and now has a very low prevalence rate in young adults (down to 3%). The rates of transmission of HTLV-I may have easily changed over time depending on transmission routes and infectious conditions. Therefore, it seems reasonable that one of two Andean mummies about 1,500-year-old is positive for HTLV-I.
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