All classes and after school activities at Three Rivers Local School District in Cleves were cancelled for Thursday, Jan. 30 and Friday, Jan. 31. because of a major flu outbreak.

Superintendent Craig Hockenberry said out of nearly 2,400 people who attend or work at three schools on campus, about 600 students and as many as 50 staff members are out sick.

Many of the students have the same symptoms, such as high fever, vomiting and body aches, he told CBS affiliate WKRC.

"Although our goal is to protect as much instructional time as possible, we also need to do everything we can to ensure our students and staff are healthy and in the best environment to foster learning," the district wrote on its website.