Food Safety News report that at least 51 students and employees at Stanford University have been sickened in a suspected norovirus outbreak, according to a spokeswoman for Santa Clara County Public Health.

The outbreak appears to have originated in the dining hall of Florence Moore Hall. Students who dine at the hall began complaining of symptoms such as diarrhea, vomiting and nausea beginning Tuesday afternoon.

Four students received emergency care for dehydration, including intravenous fluids, but none were checked in to a hospital, according to public health information officer Amy Cornell.

Cornell said that university staff would be closing the dining hall after dinner Thursday night to heavily sanitize the facilities in case there is a lingering contamination issue.