News reports say as many as three students from the same kindergarten classroom in Lexington, KY may be infected with pathogenic E. coli, as state health officials try to determine the source of the illnesses.

Two of the three children, who attended Stanford Elementary School in Lexington, were being treated at University of Kentucky Children’s Hospital on Thursday. One was confirmed to have E. coli, and the other, given the timing and type of symptoms, was suspected to have been infected by E. coli.  It was not clear whether the 5-year-old children had developed hemolytic uremic syndrome, or HUS.