The<unk>  Nervous System controls most of the functions of the body and mind. It comprises the brain, spinal cord and the nerve fibers that branch off to all parts of the body. The<unk> s are caused by viruses that attack the CNS. Existing and emerging<unk>  CNS infections are major sources of human morbidity and mortality. Virus infections usually begin in the peripheral tissues, and can invade the mammalian system by spreading into the peripheral nervous system and more rarely the CNS. CNS is protected by effective immune responses and multi-layer barriers, but some viruses enter with high-efficiency through the bloodstream and some by directly infecting the nerves that innervate the tissues. Most viruses that enter can be opportunistic and accidental pathogens, but some like herpes viruses and rabies virus have evolved in time to enter the nervous system efficiently, by exploiting the neuronal cell biology. While acute<unk>  diseases come on quickly, chronic<unk>  conditions have long incubation periods inside the body. Their symptoms develop slowly and follow a progressive, fatal course.
Central nervous system viral disease
CNS demyelinating autoimmune diseases
Hereditary CNS demyelinating disease
Central nervous system tumor
Viral encephalitis
Autoimmune encephalitis
Primary and secondary brain injury
Primary central nervous system lymphoma