There is also a chance norovirus can spread through the air from vomit, so those who are in close proximity to someone with norovirus, like health care workers or parents caring for a sick child, should consider wearing a mask to prevent infection.

Cases of norovirus are surging in the United States. It’s the country’s leading cause of foodborne illnesses but there have been even more outbreaks than usual recently — hitting schools, holiday gatherings and cruise ships.

What should you do to protect yourself from the norovirus?