STEC can produce two types of Stx, Stx1, and Stx2, which are further subdivided into, Stx1a, Stx1c, Stx1d, Stx2a, Stx2b, Stx2c, Stx2d, Stx2f, and Stx2g, where Stx2a and Stx2c are the most prevalent subtypes that have been associated with HUS in patients (Sheoran et al., 2003; Bhunia, 2018). This evidence concerns the gene STX2 and hemolytic-uremic syndrome.