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SAN DIEGO — There have been 10 confirmed cases in the deadly E. coli outbreak possibly linked to animals at the San Diego County Fair, health officials said Wednesday.

One probable case has also been reported.

On June 28, the San Diego County Health and Human Services Agency announced a 2-year-old boy died and three other children became ill following E. coli infections that may be related to contact with animals at the San Diego County Fair.

A doctor with the agency said there could be more cases in the coming weeks.

“We will probably learn about them because it takes about 10 days before someone gets symptoms,” said Dr. Eric McDonald. “People will then go to a doctor for those symptoms, a test will be done and then we will be notified.”

The source of the bacteria is under investigation but all children reportedly visited the animal areas, the petting zoo or had other animal contact at the fair, officials said.