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Causes of encephalitis include viruses such as herpes simplex virus and rabies virus as well as bacteria, fungi, or parasites. [1] [2] Other causes include autoimmune diseases and certain medications. [2] In many cases the cause remains unknown. [2] Risk factors include a weak immune system. [2]
Viruses that cause viral encephalitis first infect the body and replicate outside of the central nervous system (CNS). Thereafter, most reach the spinal cord and brain via the circulatory system. Exceptions to this include herpesviruses and the rabies virus, which travel from nerve endings to the CNS.
Most forms of aseptic meningitis are viral in origin, though neoplastic and Lyme disease meningitis are also aseptic. California encephalitis virus; Central nervous system viral disease; Cytomegalovirus encephalitis; SARS-CoV-2; Eastern equine encephalitis; Enterovirus encephalitis; Epstein Barr Virus encephalitis; Herpes simplex encephalitis ...
Acute - the most common diseases caused by acute viral infections are encephalitis, flaccid paralysis, aseptic meningitis, post infectious and encephalomyelitis.; Chronic - the most common diseases caused by chronic viral infections are subacute-sclerosing panencephalitis, progressive multifocal leukoencephalopathy, retrovirus disease and spongiform encephalopathies.
Acute necrotizing encephalopathy (ANE) or sometimes necrotizing encephalitis or infection-induced acute encephalopathy (IIAE) is a rare type of brain disease (encephalopathy) that occurs following a viral infection. [4] Most commonly, it develops secondary to infection with influenza A, influenza B, and the human herpes virus 6. ANE can be ...
About 90% of cases of herpes encephalitis are caused by herpes simplex virus-1 (HSV-1), the same virus that causes cold sores. According to a 2006 estimate, 57% of American adults were infected with HSV-1, [3] which is spread through droplets, casual contact and sometimes sexual contact, though most infected people never have cold sores.
The rare but serious disease is generally spread to humans through the bite of an infected mosquito. Massachusetts sees 1st human case of Eastern equine encephalitis since 2020. Here's what to know
TBE is caused by tick-borne encephalitis virus, a member of the genus Flavivirus in the family Flaviviridae. It was first isolated in 1937 in the USSR by a team led by Lev A. Zilber. Three virus sub-types also exist: European or Western tick-borne encephalitis virus (transmitted by Ixodes ricinus)