A student who attends Glacial Drumlin School, the middle school in the Monona Grove School District, was diagnosed and treated for E. coli, a Public Health Madison and Dane County spokesman said Friday.

Spokesman Jeff Golden said it appeared to be an "isolated case."

The student’s sibling also exhibited symptoms, but the infection had not been confirmed, Golden said.

Principal Renee Tennant said the cases were not school-related, but parents were notified as a precaution.