What are the differences and concepts between epidemic cerebrospinal meningitis and epidemic encephalitis B?

Encephalomyelitis is purulent meningitis caused by meningococcus, which is characterized by the formation of pus in subarachnoid space.

Japanese encephalitis is a degenerative inflammation of brain parenchyma caused by Japanese encephalitis virus. It mainly involves the essence of the central nervous system, especially the cerebral cortex, basal nucleus and diencephalon, and the spinal cord is the lightest. Four typical changes can be seen under light microscope: cerebrovascular changes (sleeve phenomenon); Degeneration and necrosis of nerve cells; The formation of cribriform softening focus; Glial nodule formation.