(also known as the "Norovirus")
Nausea, vomiting, diarrhea, and fever are all symptoms of Norovirus, which is highly contagious and very common in January.
You can prevent Norovirus by washing your hands BEFORE eating and AFTER using the restroom. Use soap and warm water, and wash for at least 20 seconds. Alcohol-based hand sanitizer can also be used, but it is not as effective as soap and water.