In group A, all strains contained a stx2 subtype and eae, in group B 33% contained stx2 subtypes and all strains eae. In group C stx1 dominated, 30% contained stx2b, and none of the strains contained eae. Group A was significantly associated with BD (p = 0.0004) and high symptom score (p = 0.0007). Here, STX1A is linked to Behcet disease.