This abstract reviews 8 studies on the use of antibiotics in treating children diagnosed with E. coli O157:H7 diarrhea and the risk of developing hemolytic uremic syndrome (HUS). While some studies had conflicting results, most larger studies found that antibiotic use increased the risk of HUS. Certain factors were associated with higher risk, such as severity of illness, starting antibiotics early in the diarrhea phase, and using bactericidal antibiotics. The conclusions indicate an increased risk was seen with larger sample sizes and certain antibiotics, timing of use, and illness severity may influence HUS risk.