Remember the suspicious rash that plagued nearly 100 students and staff at Carl Sandburg School in Freeport? It still has health experts puzzled.
The Centers for Disease Control have been conducting tests to figure out the cause of the itchy red rash, but the results are inconclusive.
The CDC ran blood tests on recent patients. They were looking to see if Phipps' disease or the Parvo virus was the cause, but all tests came back negative.
The CDC says since all the cases have since cleared up, they'll close their investigation.