Epidemiology
Because women may be underdiagnosed, the exact incidence of reactive arthritis is difficult to estimate. A few studies have been completed, though. In Norway between 1988 and 1990, incidence was 4.6 cases per 100,000 for Chlamydia-induced Reiter's Syndrome and 5 cases per 100,000 for that induced by enteric bacteria. In 1978 in Finland, the annual incidence was found to be 43.6 per 100,000.
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