The human T-cell leukemia virus type I ( HTLV-I ) is a causative agent of adult T-cell leukemia .
the human t-cell leukemia virus type i ( htlv-i ) is a causative agent of adult t-cell leukemia .
O 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