Reading Summer Festival Days lasted from July 31 to Aug. 3, but the outbreak came from one event.

“There were eight laboratory-confirmed cases and 33 probable cases” among the more than 250 people who attended an alumni reunion dinner Aug. 2, CHA health officer Steve Todd said. After being notified of the illnesses on Aug. 11 Todd put his department to work to contact attendees.

The community invited back all those who had attended Reading schools from across the state and country. Two members of the class of 1942 were present.

About 150 were found and interviewed by phone. “Several of the individuals either had been seen by a doctors or were hospitalized,” Todd said.

Many were in their 70s.

Because notification came nine days after the event there was little food to test.