The next time you reach out to shake someone's hand, consider this: A recent study of hand-washing found only 5 percent of people who used the restroom scrubbed long enough to kill germs that can cause infections.
Thirty-three percent didn't use soap, and 10 percent didn't wash their hands at all, according to the study, based on Michigan State University researchers' observations of more than 3,700 people in a college town's public restrooms.
"These findings were surprising to us because past research suggested that proper hand washing is occurring at a much higher rate," said lead investigator Carl Borchgrevink, an associate professor of hospitality business.
Among the other findings:
Here's how to do it right: Use soap, scrub well (including the backs of your hands, between your fingers, and under your nails) for at least 20 seconds, and dry your hands afterward. People only wash their hands for an average of 6 seconds, according to the study, published recently in the Journal of Environmental Health.
Read more from U.S. News.