Generally speaking, the natural course of fever caused by viral infections is about 7-14 days. If a clear diagnosis of viral infection is made, the routine blood results will indicate a high level of lymphocytes, and the results of the viral nine tests will clearly indicate which kind of viral infection is present, and recurrent fever is a more typical symptom of viral infection. In addition, we need to regularly observe changes in the condition during treatment to see if there is any aggravation of coughing, coughing or abdominal pain, diarrhea, frequent urination, urinary urgency, and to regularly recheck the blood routine and virus-related tests, C-reactive protein and other indicators during treatment. Take care not to eat spicy and stimulating food, drink more water, and drink light food such as rice porridge or noodle soup to control the gastrointestinal tract, which can play a good role in assisting the recovery of infection.