FIG. 2.

IgG, IgM, and IgA antibody responses in serum. (A) Antibody responses against rTbpA. (B) Antibody responses against rTbpB. The infected groups are divided into those with a first gonococcal infection (filled symbols) and those with at least one prior episode of gonorrhea (open symbols). The control group is divided into volunteer lab personnel (filled symbols) and individuals attending an STD clinic who were culture negative with no previous history of gonococcal disease (open symbols). The horizontal bars indicate median values. Differences between the groups were compared with the Mann-Whitney U test or the Kolmogorov-Smirnov test where appropriate. Note the logarithmic scales.