Hillsdale Daily News reports that the Salmonella outbreak which struck the Reading Summer Festival Days the weekend of July 31 was part of an eight-state outbreak from contaminated berries or melons, according to health officer Steve Todd of the Branch-Hillsdale-St. Joseph Counties Community Health Agency (CHA).

Todd said the outbreak now has 12 lab-confirmed cases of the foodborne intestinal disease including “several additional secondary cases that appear to be either family members or otherwise related to a person that was ill.”

Interviews with those who have had contact with people infected during the event continues “to prevent an outbreak from getting into food service establishments, daycares, or healthcare settings,” Todd said.

The Center for Disease Control (CDC) said the Reading outbreak was a sub-cluster of the larger outbreak. The particular strain of Salmonella “is normally associated with poultry.”

The CDC has not been able to locate the exact source of the contaminated food.