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We studied 95 women with uncomplicated Chlamydia trachomatis cervical infection. Quantitative isolation of C. trachomatis was performed in HeLa 229 cells, and the results were correlated with serum immunoglobulin M and immunoglobulin G antibody to the organism. We found that quantitative cultures for C. trachomatis can provide a meaningful measurement by which to evaluate the effect of the acquired immune response. In particular, secretory immunoglobulin A antibody to C. trachomatis in cervical secretion demonstrated a striking and inverse correlation with recovery of the organism from the cervix. It is suggested that this component of the immune response may regulate shedding of the organism.

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