Marinscope Newspapers > Mill Valley Herald > News > Norovirus outbreak strikes Marin senior facilities
The gastrointestinal illness occurs year-round but is more common in winter when people are indoors more, Cronan said. “It’s the most common gastrointestinal illness in the United States. We see more and more of it every year.”
The virus was identified in 1984, Cronan said. It spreads from person to person via doorknobs, computer keyboards, etc., and then putting hands to mouth.