Purulent meningitis and viral meningitis are different diseases. Purulent meningitis is caused by bacterial infection of the meninges. Viral meningitis is caused by viral invasion of the meninges. Generally, purulent meningitis is more severe, and patients may exhibit symptoms of systemic toxin poisoning, such as high fever, nausea, vomiting, sickly appearance, and general weakness. The symptoms of viral meningitis are relatively mild, and the fever is not particularly severe. Another important differentiation is based on the analysis of cerebrospinal fluid. In viral meningitis, the lumbar puncture shows that the white blood cell count is below 1000*10^6/L, and the levels of sugar and chloride are generally normal or slightly low, with protein usually mildly elevated. In purulent meningitis, the cerebrospinal fluid shows a significant increase in white blood cell count, even reaching from 1000*10^6/L to 10000*10^6/L; the protein content is significantly increased, the sugar content is markedly decreased, and chloride levels are reduced. Additionally, bacteria can be found in the cerebrospinal fluid and blood cultures in purulent meningitis, whereas viral meningitis cerebrospinal fluid cultures do not show bacteria.