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→Reactive Arthritis
==Reactive Arthritis==
==Reactive Arthritis==
*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
*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. '''More common in patients with HLA-B27 serotype.'''
*Dx: '''Urine PCR for Chlamydia'''
*Dx: '''Urine PCR for Chlamydia'''. Joint aspiration shows inflammatory profile with '''negative culture.'''
*Tx: NSAIDs first line. Intraarticular glucocorticoids or methotrexate are second line.
*Tx: NSAIDs first line. Intraarticular glucocorticoids or methotrexate are second line.