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Thorough hand washing is typically recommended. But use of hand sanitizers is promoted, too. However, a recent study found that staff in long-term care facilities who relied too much on hand sanitizers over hand washing actually reported more outbreaks of norovirus-related illness.
Alcohol rub sanitizers containing 70% alcohol kill 3.5 log10 (99.9%) of the bacteria on hands 30 seconds after application and 4 to 5 log10 (99.99 to 99.999%) of the bacteria on hands 1 minute after application. Alcohol rub sanitizers can prevent the transfer of health-care associated pathogens (Gram-negative bacteria) better than soap and water.