UPDATE...From The Detroit News: Health officials have identified the cause of the stomach sickness outbreak at Michigan State University as norovirus, a highly contagious virus that's perhaps best known for sickening cruise ship passengers. Health officials suspected norovirus was the culprit and put measures into place Wednesday to help control the outbreak. They encouraged students to open windows to increase ventilation and cleaning crews disinfected dining halls, bathrooms and areas where sick students lived. The cafeteria remains closed in Shaw Hall, where many of the students lived.
From The Detroit Free Press: Michigan State University in East Lansing has closed a dining hall indefinitely and briefly pulled produce from all others after nearly 30 students were treated for possible food poisoning. The undergraduates lived in or ate meals at Shaw Hall, the university says. No students are in serious condition. Many have been released, and the outbreak's cause is under investigation.