Officials say at least 100 people from 25 states who attended a national letter carrier's convention in western Michigan have reported flu-like symptoms.
The Kent County Health Department says the people who were sickened attended the National Rural Letter Carriers' Association convention at DeVos Place in Grand Rapids from Aug. 14-17. Department spokesman Steve Kelso tells The Grand Rapids Press that one of those sickened required a hospital stay.
Health officials say influenza is suspected since symptoms generally involve cough, sneezing and fever.
WOOD-TV reports the source of the illnesses is under investigation. Several thousand people attended the event and Kelso says he isn't aware of any DeVos Place employees becoming ill.