Two New Jersey colleges, Rider University and Princeton University, have been struck with the flu-like norovirus that has led to the hospitalization of about 160 students since late January, including 11 students from Riders Thursday night.

According to a university written statement, most of these students have been discharged from the hospital and returned to campus. Authorities suspect the outbreak originated at Princeton and have alerted neighboring schools.

Norovirus often begins suddenly, with a person experiencing stomach cramping, vomiting or diarrhea, according to the CDC. Most people recover within a few days.

According to USA Today, Rider officials are cleaning all dorm bathrooms and buildings because the virus is highly contagious.

How to avoid norovirus:

  • Properly wash hand with soap and water
  • Wash fruits and vegetables
  • Do no prepare food while infected
  • Clean contaminated surfaces
  • Wash laundry thoroughly
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