Health officials are testing for the source of a confirmed E. coli infection suffered by one elementary school student in Monett, while about 60 other students are suffering similar symptoms, according to the Associated Press.

So far, the city water system has come up clean and there is no evidence the infection reported Sunday came from the campus of the Monett Elementary School.

District Superintendent Dr. Charles Cudney asked the state health department to investigate after over 100 children called in sick or did not attend the school last Tuesday.

As of Wednesday afternoon, the department of health had not determined that the source for any of the illnesses was at the school.