Wash your hands thoroughly with soap and water
- especially after using the toilet or changing diapers
- always before eating, preparing, or handling food, and
- before giving yourself or someone else medicine.
Norovirus can be found in your vomit or poop even before you start feeling sick. The virus can stay in your poop for 2 weeks or more after you feel better. It is important to continue washing your hands often during this time.
You can use alcohol-based hand sanitizers in addition to hand washing.
But, you should not use hand sanitizer as a substitute for washing your hands with soap and water. Hand sanitizers aren’t as effective as washing hands with soap and water at removing norovirus particles.
link to source: https://www.cdc.gov/norovirus/about/prevention.html