3. Norovirus Fact Sheet - health.pa.gov
Description: What are the symptoms of illness caused by noroviruses? - The symptoms of norovirus illness usually include nausea, vomiting, diarrhea, and some stomach cramping. Sometimes people also have a low-grade fever, chills, headache, muscle aches, and a general sense of tiredness. The illness often begins suddenly, and the infected person may feel very sick.