Understanding Norovirus Outbreaks Norovirus, a highly contagious stomach illness, tends to spread rapidly in crowded environments such as cruise ships, long-term care facilities, and schools. While anyone can become infected, young children and the elderly are particularly at risk for severe symptoms. Norovirus impacts the stomach and intestines, leading to symptoms like diarrhea, vomiting, nausea, and stomach cramps. Additional symptoms may include fever, headaches, and body aches. After