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Pelvic inflammatory disease (PID) is a leading cause of both tubal factor infertility and ectopic pregnancy. Chlamydia trachomatis is an important risk factor for PID, but the proportion of PID cases caused by C. trachomatis is unclear. Estimates of this are required to evaluate control measures.

Proportion of Pelvic Inflammatory Disease Cases Caused byChlamydia trachomatis: Consistent Picture From Different Methods