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Serum IgA1, IgA2, and IgG antibody levels to the homologous infecting isolates from male patients at visit 1 (enrollment and treatment), visit 2 (2 weeks after treatment), and visit 3 (4 weeks after treatment). Differences between visits were compared with the Wilcoxon signed-rank test. Filled symbols indicate patients reporting at least one previous episode of gonorrhea. Note logarithmic scales.
