Norovirus, which usually has an incubation period of 24-48 hours, with a minimum of 12 hours and a maximum of 72 hours, and its most common symptoms are diarrhea, vomiting, regurgitation, nausea, and stomach pain. Other symptoms include fever, headache, and generalized aches and pains. Most children recover about 1-3 days after the onset of the disease. Preschool children tend to present with vomiting, while adults have predominantly diarrheal symptoms, with yellow, dilute, watery stools, ranging from a few to a dozen times a day, without pus, blood or mucus. In addition, it can also be accompanied by headache, chills and muscle pain, and severe patients can develop symptoms of dehydration. Norovirus has a long detoxification process and remains contagious even two days after symptoms disappear.