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Sera from 159 men attending the sexually transmitted disease clinic at Karolinska Hospital, Stockholm, Sweden, were analyzed for the presence of immunoglobulin A (IgA) and IgG antibodies to a panel of synthetic peptides derived from the E2, L1, and L2 regions of the human papillomavirus types 1 (HPV 1), 6, 8, 11, 16, 18, 31, and 33. The study subjects were divided into three groups: (i) asymptomatic men with no history of genital warts who served as controls, (ii) men with visible condylomata, and (iii) men who had previously been afflicted with condylomata. There were no significant differences in antibody titers for any of the HPV 6- or 11-derived peptides among patients with current condylomata and the controls. For the peptide from L1 of HPV 6, there was an increase in the IgG titers among men with previous condylomata compared with the titers for the controls (52% versus 27% seropositivity; P less than 0.05). Also, for the peptide from L2 of HPV 6, there was an increase in the IgG titers among men who had been afflicted with condylomata previously (P less than 0.05). Increased IgA antibody titers against an HPV 16-derived peptide and an HPV 18-derived peptide were also detected. For the peptides from L1 and L2 of HPV 6, the study was extended to an additional group of 127 males attending the sexually transmitted disease clinic at Huddinge Hospital in southern Stockholm. Again, significantly increased antibody levels were detected only for IgG and only among asymptomatic men with a history of condylomata (P &lt; 0.01 for the L1 peptide and P &lt; 0.05 for the L2 peptide). The results suggest that the IgG response against the late proteins of HPV 6 reflects mainly previous exposure to the virus rather than ongoing viral disease.

journal of clinical microbiology

Levels of immunoglobulin G antibodies against defined epitopes of the L1 and L2 capsid proteins of human papillomavirus type 6 are elevated in men with a history of condylomata acuminata