Stomach flu—Norovirus

Use soap and water, not hand sanitizer to protect from the flu virus.

Alcohol-based hand sanitizers may stop bacterial infections and even cold and some flu strains in their tracks. But when it comes to norovirus, they don’t do much good. That’s because alcohol in the sanitizer can rupture the "envelopes" around viruses like the flu, according to the New York Times. Norovirus doesn’t have such an envelope, so the alcohol doesn't destroy it.

A CDC study of long-term care facilities published in 2011 found that those where the staff primarily used hand sanitizer to disinfect were six times more likely to have a norovirus outbreak than those where staffers lathered up with soap and water.

http://www.rd.com/slideshows/stomach-flu-prevention/#ixzz2keSzMDzF