Complications

For most people, norovirus infection usually clears up within a few days and isn't life-threatening. But in some people — especially children, older adults and people with compromised immune systems — norovirus infection can cause dehydration. Norovirus infection can cause severe dehydration, malnutrition and even death, especially in people who are older or immunocompromised, or in women who are pregnant.

Warning signs of dehydration include:

• Fatigue
• Dry mouth and throat
• Listlessness
• Dizziness
• Decreased urine output

Children who are dehydrated might cry with few or no tears. They might be unusually sleepy or fussy.