STX2 and hemolytic-uremic syndrome: We also examined the effect of antibiotic treatment on SOS and Stx2 production in two HUS-associated non-O157 EHEC strains, HUSEC-1, an O111:H10 strain and HUSEC-41, an O104:H4 strain that is very closely related to the strain that was responsible for a massive EHEC outbreak in Germany in 201115,16.