Immune response to genital chlamydial infection and influence ofChlamydia pneumoniae (TWAR) antibodies

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Abstract
Chlamydial IgG antibodies at a titre of at least 32 were found to occur at approximately the same frequency (76–88%) in three groups of patients who had been treated for genital chlamydial infection. Twenty-four patients who had recovered from acute salpingitis, however, had a higher geometric mean titre (GMT; 176) than 59 pregnant women (GMT 44) or 61 patients with uncomplicated genital chlamydial infection (GMT 57). The chlamydial antibody titres thus seemed to reflect the severity of inflammatory involvement. Antibodies to the new speciesChlamydia pneumoniae (previously known asChlamydia TWAR), did not influence the frequency or titre of antibodies toChlamydia trachomatis, arguing against the possibility of cross-reactivity or shared antigens. There was assumed to be no cross-immunity, since patients withChlamydia trachomatis infection did not have a lower frequency of antibodies toChlamydia pneumoniae.