To prevent the spread of norovirus, the following precautions should be taken:

1. Wash your hands frequently and correctly with soap and water for at least 20 seconds, especially after using the toilet, before preparing food, and after eating.
2. Thoroughly wash fruits and vegetables before consumption, and cook all foods, including seafood, completely to the appropriate temperature.
3. Avoid close contact with others when you show symptoms of illness, and stay home if possible.
4. Regularly clean and disinfect frequently touched surfaces (door handles, faucets, toilet flushes, etc.), especially in areas like bathrooms and kitchens.
5. Use appropriate personal protective equipment such as gloves and a mask when cleaning areas contaminated with vomit or feces, and dispose of waste safely.