VANCOUVER -- Over 100 people have fallen sick following a suspected norovirus outbreak at two Vancouver-area hotels over the weekend.

Claudia Kurzac, Vancouver Coastal Health's manager for environmental health, says the Sheraton Vancouver Airport Hotel and the Hilton Vancouver Airport Hotel were affected although a confirmation of norovirus won't come until test results are back next week.

Steve Veinot, general manager of the Sheraton at the airport, says it is sanitizing all hard surfaces, kitchens, public spaces and guest rooms.

He says the hotel will not open until they are confident it is safe and the health authority gives them the go ahead.

Veinot says the source of the virus hasn't been identified.

The Hilton hotel could not be reached for comment.

Vancouver Coastal Health says noroviruses are a group of viruses that cause severe gastroenteritis, commonly referred to as the stomach flu.