Stay up to date with notifications from The Independent Notifications can be managed in browser preferences. All News Sport Culture Lifestyle (Alamy/PA) (Alamy/PA) Norovirus is a highly contagious virus that causes acute gastroenteritis, characterized by severe vomiting and diarrhea, and is distinct from the influenza virus despite sometimes being called the stomach flu, according to the CDC. Symptoms typically appear 12 to 48 hours after exposure and can be extremely debilitating, involving frequent vomiting and diarrhea, though most individuals recover within one to three days. The illness carries a significant risk of dehydration due to rapid fluid loss, especially in vulnerable populations such as young children, older adults, and people with other underlying health conditions. Anyone can contract norovirus, with outbreaks affecting people of all ages, and an individual's genetic predisposition can influence their likelihood of infection.…