Data collection Infection control data are collected on all patients undergoing cardiac surgery using established institutional definitions for infections. Incidence of sternal infections, donor site infections, vein harvest site infection, pneumonia, urinary tract infection, catheter and blood stream infections, and clostridium difficile colitis will be considered. In addition, the incidence of diarrhea, defined as stools of liquid or gelatinous consistency, or more than three stools in one day, will be monitored. Data will be collected during hospital stay and at one-month follow-up. Finally, C-reactive protein levels, which are commonly assessed during hospitalizations and used as part of the assessment for coronary risk, will be drawn pre-operatively and four days post-operatively.