LINCOLN (AP) – The Maine Center for Disease Control says food served at a function was likely the source of a virus that sickened more than 20 people.

Penobscot Valley Hospital in Lincoln says more than three dozen employees attended a two-day customer-service training program at a lakeside event center last Monday and Tuesday. Spokeswoman Allison Bankston says that by Wednesday morning, 10 of those employees had called in sick.

Assistant state epidemiologist Geoff Beckett says the norovirus has been identified in at least one of the victims, all of whom have now recovered. He says a meal is a way to transmit the virus, which causes symptoms such as vomiting and diarrhea.