There are five main causes of infections of the central nervous system (CNS): bacterial,

viral Viral means "relating to viruses" (small infectious agents). Viral may also refer to: Viral behavior, or virality Memetic behavior likened that of a virus, for example: * Viral marketing, the use of existing social networks to spread a marke ...

, fungal,

protozoa Protozoa (singular: protozoan or protozoon; alternative plural: protozoans) are a group of single-celled eukaryotes, either free-living or parasitic, that feed on organic matter such as other microorganisms or organic tissues and debris. Histo ...

l, and

prion Prions are misfolded proteins that have the ability to transmit their misfolded shape onto normal variants of the same protein. They characterize several fatal and transmissible neurodegenerative diseases in humans and many other animals. It ...

ic.

Fungal

Cryptococcal meningitis Cryptococcosis is a potentially fatal mycosis, fungal infection of mainly the lungs, presenting as a pneumonia, and brain, where it appears as a meningitis. Cough, shortness of breath, difficulty breathing, chest pain and fever are seen when the ...

* Brain abscess *

Spinal epidural infection Spine or spinal may refer to: Science Biology * Vertebral column, also known as the backbone * Dendritic spine, a small membranous protrusion from a neuron's dendrite * Thorns, spines, and prickles, needle-like structures in plants * Spine (zoolo ...

Protozoal

* Toxoplasmosis * Malaria * Primary amoebic meningoencephalitis *

Granulomatous amoebic encephalitis Granulomatous amoebic encephalitis (GAE) is a rare, usually fatal, subacute-to-chronic central nervous system disease caused by certain species of free-living amoebae of the genera ''Acanthamoeba'', ''Balamuthia'' and ''Sappinia''. The term is m ...

Amoebic brain abscess Amoebic brain abscess is an affliction caused by the anaerobic parasitic protist '' Entamoeba histolytica''. It is extremely rare; the first case being reported in 1849. Brain abscesses resulting from '' Entamoeba histolytica'' are difficult to di ...

Viral

* Viral meningitis * Eastern equine encephalitis * St Louis encephalitis * Japanese encephalitis *

West Nile encephalitis West Nile fever is an infection by the West Nile virus, which is typically spread by mosquitoes. In about 80% of infections people have few or no symptoms. About 20% of people develop a fever, headache, vomiting, or a rash. In less than 1% of ...

Tick-borne encephalitis Tick-borne encephalitis (TBE) is a viral infectious disease involving the central nervous system. The disease most often manifests as meningitis, encephalitis or meningoencephalitis. Myelitis and spinal paralysis also occurs. In about one third ...

Herpes simplex encephalitis Herpesviral encephalitis, or herpes simplex encephalitis (HSE), is encephalitis due to herpes simplex virus. It is estimated to affect at least 1 in 500,000 individuals per year, and some studies suggest an incidence rate of 5.9 cases per 100,000 ...

* Rabies * California encephalitis virus * Varicella-zoster encephalitis * La Crosse encephalitis *

Measles encephalitis Measles is a highly contagious infectious disease caused by measles virus. Symptoms usually develop 10–12 days after exposure to an infected person and last 7–10 days. Initial symptoms typically include fever, often greater than , cough, ...

* Nipah virus encephalitis *

Poliomyelitis Poliomyelitis, commonly shortened to polio, is an infectious disease caused by the poliovirus. Approximately 70% of cases are asymptomatic; mild symptoms which can occur include sore throat and fever; in a proportion of cases more severe sym ...

* Slow virus infections, which include: ** Subacute sclerosing panencephalitis **

Progressive multifocal leukoencephalopathy Progressive multifocal leukoencephalopathy (PML) is a rare and often fatal viral disease characterized by progressive damage (''-pathy'') or inflammation of the white matter (''leuko-'') of the brain (''-encephalo-'') at multiple locations (''mu ...

** Acquired immunodeficiency syndrome (AIDS)

Prionic

* Creutzfeldt–Jakob disease and its

variant Variant may refer to: In arts and entertainment * ''Variant'' (magazine), a former British cultural magazine * Variant cover, an issue of comic books with varying cover art * ''Variant'' (novel), a novel by Robison Wells * " The Variant", 2021 e ...

* Gerstmann–Sträussler–Scheinker syndrome *

Kuru Kuru may refer to: Anthropology and history * Kuru (disease), a type of transmissible spongiform encephalopathy associated with the cannibalistic funeral practices of the Fore people * Kuru (mythology), part of Meithei mythology * Kuru Kingdom, ...

Variably protease-sensitive prionopathy Variably protease-sensitive prionopathy (VPSPr) (formerly known as Protease Sensitive Prionopathy) is a sporadic prion protein disease first described in an abstract for a conference on prions in 2006, and this study was published in a 2008 report ...

* Familial spongiform encephalopathy

Post-infectious diseases of the central nervous system

* PANDAS (controversial hypothesis) *

Sydenham's chorea Sydenham's chorea, also known as rheumatic chorea, is a disorder characterized by rapid, uncoordinated jerking movements primarily affecting the face, hands and feet. Sydenham's chorea is an autoimmune disease that results from childhood infecti ...

* Acute disseminated encephalomyelitis * Guillain–Barré syndrome

References