(Cambridge, MA – March 31, 2005) – Donna Campbell, Employee Health Nurse and Infection Control Surveillance Officer at Harvard Health Services, cleans her hands using Purell Hand Sanitizer from one of many dispensers mounted to the walls in Health Services. A recent study shows that use of alcohol-based hand sanitizers can reduce the spread of the viruses that cause respiratory and gastrointestinal illnesses. Staff photo Peter DiCampo/Harvard University News Office