December 15, 2005

The Cincinnati Health Department has determined what caused hundreds to become ill after attending events at the Hilton Netherland Plaza downtown.

It was norovirus, part of the Norwalk virus group which has affected passengers on cruise ships.

An investigation was launched after 500 people got sick a couple of weeks ago.

None was hospitalized.

The norovirus is a common food borne illness that causes nausea, vomiting and cramps.

The health department sees no threat to guests staying at the hotel but will continue to monitor the food service at the hotel.