Evaluate the clinical efficacy and safety of WC2031 200 mg tablets taken orally once a day for 7 days versus Vibramycin (doxycycline) 100 mg capsules taken orally twice a day for 7 days, for the treatment of uncomplicated urogenital Chlamydia trachomatis infection. Primary efficacy endpoint is microbiological cure at Day 28. Safety assessments are adverse events, changes in vital signs and laboratory test results.