*H&P: Monoarticular arthritis, most commonly in the knee, associated with uveitis, and urethritis, after infection with Chlamydia, Shigella, Salmonella, Campylobacter, Yersinia, or C. diff
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*Dx: '''Urine PCR for Chlamydia'''
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*Tx: NSAIDs first line. Intraarticular glucocorticoids or methotrexate are second line.