Researchers studying epidemiology of health-care-associated infections (HAIs) found that rates of CDI surpassed infection rates for MRSA. Scientists also discovered that health-care-associated CDI, which is a bacterium that causes diarrhea and more serious intestinal conditions such as colitis, occurs more often (21 percent) than healthcare-associated infections due to MRSA. In addition, health-care-associated CDI occurs approximately as often as health-care-associated bloodstream infections and combined device-related infections.