How is Yersinia enterocolitica food poisoning diagnosed?

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Yersinia enterocolitica is detected in stools as well as in blood and lymph nodes, so your doctor may draw blood or ask for a stool sample. There is also a test that shows whether you have an antibody to the bacteria in your blood. When you have a bacterial or viral infection, your body develops antibodies as it is fighting the infection. The presence of such antibodies can therefore indicate whether you currently have or have had Yersinia enterocolitica.