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Concentrations of antibodies (IgA, IgG, and IgM) to chlamydial LPS at baseline and 1 and 6 months after PTCA in patients with positive anti-C. pneumoniae antibody titers at the time of PTCA (determined by EB ELISA; solid line) and seronegative individuals (dotted line). Concentrations of chlamydial antibodies are expressed as an index (optical density of the sample/cutoff). Error bars indicate standard errors of the means. ∗, P < 0.05; ∗∗, P < 0.005 versus baseline levels.
