Human T-cell leukemia virus type 1 ( HTLV-1 ) is the etiologic agent of adult T-cell leukemia .
human t-cell leukemia virus type 1 ( htlv-1 ) is the etiologic agent of adult t-cell leukemia .
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