Human T-cell leukemia virus type I ( HTLV-I ) is an etiological agent of adult T-cell leukemia ( ATL ) .
human t-cell leukemia virus type i ( htlv-i ) is an etiological agent of adult t-cell leukemia ( atl ) .
B-virus I-virus I-virus I-virus I-virus I-virus O B-virus O O O O O O B-other_name I-other_name I-other_name O B-other_name O O