Which of the following statements is true about the symptoms of Norovirus?

The statement that symptoms include nausea and diarrhea is accurate in the context of Norovirus infections. Norovirus is commonly associated with gastroenteritis, which is an inflammation of the stomach and intestines. The hallmark symptoms of this illness are indeed nausea, vomiting, diarrhea, and abdominal pain. These symptoms usually manifest within 12 to 48 hours after exposure to the virus and can be quite severe, leading to dehydration in some cases.

The other statements do not accurately reflect the nature of Norovirus symptoms. For example, symptoms do not only appear after eating unhealthy food; infections can occur through contamination of food or surfaces, regardless of the food's healthiness. Norovirus symptoms also typically resolve within one to three days, rather than lasting longer than a week. Lastly, Norovirus primarily affects the gastrointestinal system, not the respiratory system, making the claim that symptoms are purely respiratory incorrect.