From the New York Times : How to Prepare for the Coronavirus
“hand-washing reduced the risk of transmission by 30 to 50 percent, she said. The thing is, Americans aren’t very good at it.”
“If it is not feasible to wash your hands with water, you can use a hand sanitizer, but check the label to be sure it contains at least 60 percent alcohol.”
https://www.nytimes.com/2020/02/25/health/prepare-for-coronavirus.html