To determine whether it is a bacterial infection or a viral infection, you can start from the clinical symptoms and related examination results. 1. Clinical symptoms: patients with bacterial infection mostly show symptoms such as unstable body temperature, purulent nasal discharge, coughing up yellow sputum, etc., while patients with viral infection mostly show symptoms such as obviously elevated body temperature, clear nasal discharge, dry cough or coughing up white sputum. 2. Related examination: when patients with bacterial infection do routine blood examination, they can find that the white blood cells have obvious elevation, and when they do lung imaging examination, they can find that the lung parenchyma changes; while patients with viral infection, their blood white blood cells will be reduced, and when they do lung imaging examination, they can find that the interstitium of the lungs changes. Whether it is bacterial infection or viral infection, we should go to the hospital in time when there are uncomfortable symptoms, and give symptomatic treatment under the guidance of the doctor, such as bacterial infection, you can take metronidazole, clindamycin, cephalosporin and other drugs for treatment; and viral infection patients need to use interferon, adamantadine and other antiviral drugs for treatment.