The Sandusky County Health Department in Ohio is investigating the source of a Ross High School student’s E. coli case.

Since the source of the outbreak has not been identified, SCHD sent home a letter with students at Ross High School so that they would be aware of the symptoms of E. coli infection.

Fremont School Superintendent Traci McCaudy said that the cleaning staff disinfected all of the classrooms, following strict health department guidelines. The student can return to school when she is symptom free.

In addition, Wisconsin health officials are investigating an E. coli case in a student who attends St. Norbert College.