Neutralizing Antibody Responses to Chlamydia trachomatis in Women and Associations With Chlamydia Outcomes.

Yu, Hong; Geisler, William M; Dai, Chuanbin; Gupta, Kanupriya; Cutter, Gary; Brunham, Robert C · J Infect Dis · 2025

cross_sectional · Level IV

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Abstract

We assessed neutralizing antibody responses in a well-characterized cohort of 60 women with different Chlamydia trachomatis infection outcomes noted at a treatment visit and 3-month follow-up. We found varying rates of neutralization (inhibition of C trachomatis) in sera at different dilution levels and varying neutralizing antibody titers across outcomes. Median neutralization rates were significantly higher in sera at high dilutions (1:320-1:1280) from women with spontaneous resolution vs persisting infection before treatment (all P < .05). These findings suggest that neutralizing antibody responses may contribute to protective immunity against chlamydia.

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