The cerebrospinal fluid tests show an increase in leukocytes mainly as a sign of inflammation, which can be seen mainly in inflammatory lesions of the cerebrospinal membranes and brain parenchyma, viral encephalitis, intracerebral parasitic infections, septic meningitis, etc., all of which can cause an increase in leukocytes in the cerebrospinal fluid. Once encephalitis occurs, anti-inflammatory treatment is required, and appropriate antibiotics can be used according to the results of drug sensitivity. In addition, symptomatic supportive treatment is needed to maintain the electrolyte balance in the body, keep the breathing open, pay attention to hydration, if the patient is in a coma, timely intravenous rehydration, placement of gastric tube, and nasal feeding liquid diet. If the patient is not yet comatose and can eat on his own, he must drink more water and eat a light, easily digestible diet.