The Centers for Disease Control and Prevention provides information about norovirus outbreaks on its website, at CDC.gov. In addition, the CDC provides statistical trends of norovirus infection and deaths, as well as information on common norovirius outbreak settings.
Norovirus usually spreads through contact with infected individuals, but consumption of or contact with contaminated food, water or objects can also spread norovirus, explains the CDC. Norovirus causes approximately 50 percent of food-related illness outbreaks in the United States. Common norovirus outbreak settings include health care facilities, particularly long-term care centers, restaurants and other food service centers, cruise ships, schools and other institutional settings.