Yersinia serology is no longer available.
Stool culture is the preferred test for diagnosing Yersinia pseudotuberculosis. Paired sera collected < 1 week and > 2 weeks from onset are required to diagnose presumptive Yersinia mesenteric adenitis. Reactive arthritis may be diagnosed from a single sample, provided other investigations are negative. (Dr Chris Mansell, Clinical Microbiologist)