The difference between bacterial fever and viral fever: 1. The difference between viral fever and bacterial fever lies in the change of blood routine. Usually, the total white blood cell count does not increase in viral fever, but the percentage of neutrophils decreases and the percentage of lymphocytes increases, while the total white blood cell count increases, the percentage of neutrophils increases and the percentage of lymphocytes decreases in bacterial fever. 2. If the fever is accompanied by diarrhea or conjunctival congestion, it tends to be a viral infection. 3. The fever caused by viral infection starts rapidly and the symptoms of systemic toxicity can be mild or severe, while the fever caused by bacterial infection can start rapidly or slowly and the symptoms of systemic toxicity are relatively severe. If the fever is not high at the beginning and then worsens after 2-3 days, it is mostly bacterial fever.