State health officials say the North Carolina State Fair is the focus of the investigation of an E. coli outbreak that has made at least nine people sick.
Fifteen other cases are under investigation.
State epidemiologist Dr. Megan Davies says while all two dozen people affected so far were at the fair, officials have not determined whether the cases are linked to food vendors, an animal exhibit or the petting zoo.
Davies thinks there would have been more cases if there were a contaminated food or water source.
Officials are questioning both those became sick and a random sample of those who attended the fair and did not become ill.
Four children and one adult are still hospitalized.
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