In the third model comprising stx2a, age, stx1 and stx2c, stx1 was still related to reduced risk of HUS development (OR = 0.1, CI = 0.01-0.8), whereas stx2c was not (OR = 0.6, CI = 0.1-3.3) (Table 3). Here, STX1A is linked to hemolytic-uremic syndrome.