https://www.sciencedaily.com/releases/2019/04/190415082038.htm

For every 10% increase in hand hygiene compliance, there was an associated 15% decline in the incidence of S. aureus bloodstream infection in Australia's 132 largest public hospitals, which provide over three-quarters of all public inpatient care (over 15 million patients-days nationally in 2016-17).

The results were achieved by promoting WHO's '5 Moments for Hand Hygiene' to reduce the risk of healthcare associated infection -- before touching a patient; before a clean procedure; after exposure to body fluids/wounds; after touching a patient; and after touching a patent's surroundings.