STX2 and hemolytic-uremic syndrome: According to the EFSA, ECDC, and the European Union One Health 2020 Zoonoses Report, STEC serogroups (based on the O antigen) O26, O157, O103, O145, O146, O91, O80, and O128 were most commonly identified in humans, whereas stx2a and stx2b virulence profiles were reported in patients with HUS, bloody diarrhoea, and hospitalised patients.