Figure 1From: Symptoms and sources of Yersinia enterocolitica-infection: a case-control study Symptoms of the patients. Symptoms among the subjects, from whom YE were isolated at the latest six weeks from the beginning of symptoms. Subjects with missing or unclear answers were excluded. *Statistically significant difference between bio/serotypes 3-4/O:3 or 2/O:9 and BT1A (P < 0.001).Back to article page