More than 300 patients have been infected and attempts to control it have failed. The intestinal bug causes severe diarrhoea and is resistant to the alcohol gels used to combat MRSA. The Health Protection Agency said washing hands in soap and water was necessary to eliminate the bug and powerful disinfectants were needed to clean the wards. Nationally, cases in the bug have soared from fewer than 1,000 in 1990 to 43,672 in 2004.