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A nation-wide survey of carriers of adult T-cell leukemia virus (ATLV) detected as anti-ATLA (ATLV-associated antigens) in volunteer blood donors was made in Japan. A total of 200 sera from donors between 40 and 64 years of age, collected in each of 64 blood centers located in eight districts, were tested for anti-ATLA by an indirect immunofluorescence test. The highest rate (8%) of seropositive donors was found in Kyushu and lower rates of 0.3 to 1.2% in other districts. However, the positive rate varied considerably in different localities even within districts with a high or low seropositive incidence. Further studies of all the donors (16 to 64 years old) in eight centers in Kyushu demonstrated two facts: (1) that the frequency of seropositive donors increased with age, and (2) that four centers in this district showed distinctly high incidences of seropositive donors, while the other four centers showed low incidences. The seropositive rate among all donors was estimated to be about 3% in Kyushu and 0.08 to 0.3% in all other districts.
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January 1990,
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December 1986,
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