There is a clear difference between fever caused by viral infection and fever caused by bacterial infection in terms of routine blood tests and symptoms. Blood tests for viral infections show increased lymphocytes, or a high percentage of lymphocytes, while blood tests for bacterial infections show an increased white blood cell count and increased neutrophils. Symptoms of disease caused by viral infection include nasal congestion, runny nose, clear mucus, coughing, coughing up sputum, headache and dizziness, etc. The accompanying symptoms of bacterial infection include nasal congestion, runny nose and coughing up yellow pus sputum. Symptoms of fever caused by viral infections are more severe called high fever, with a body temperature of 38.5°C or higher. The prognosis is better with active treatment, but the treatment time is relatively long. The symptoms of fever caused by bacterial infection are milder, with body temperature between 37-38.5℃, and the main treatment is antibiotics.