tokens: While the sera of EBV -negative individuals ( 0/3 ) or healthy carriers ( 0/33 ) did not contain detectable levels of antibodies , patients with mononucleosis ( 5/18 ) , chronic EBV infection ( 2/7 ) , EBV reactivation ( 7/20 ) and human immunodeficiency virus infection ( 5/24 ) showed elevated antibody titres against the enzyme .
folded_tokens: while the sera of ebv -negative individuals ( 0/3 ) or healthy carriers ( 0/33 ) did not contain detectable levels of antibodies , patients with mononucleosis ( 5/18 ) , chronic ebv infection ( 2/7 ) , ebv reactivation ( 7/20 ) and human immunodeficiency virus infection ( 5/24 ) showed elevated antibody titres against the enzyme .
labels: O O B-tissue O B-virus O O O O O O B-multi_cell I-multi_cell O O O O O O O O O O O B-multi_cell O B-other_name O O O O B-other_name B-virus O O O O O B-virus O O O O O B-virus I-virus I-virus O O O O O O O O O O O O