Encephalitis-causing virus

Encephalitis-causing viruses represent a broad and heterogeneous category of pathogens capable of invading the central nervous system to induce acute inflammation of the brain parenchyma. This group includes members from diverse viral families such as Flaviviridae (e.g., Japanese encephalitis and West Nile viruses), Togaviridae (e.g., Eastern Equine encephalitis virus), and Herpesviridae (e.g., Herpes simplex virus) [2][4][14]. These viruses typically reach the brain through hematogenous spread or retrograde axonal transport, where they infect neurons and glial cells, causing direct cellular damage and triggering a significant host immune response [3][7]. The resulting neuroinflammation often leads to cerebral edema, increased intracranial pressure, and severe neurological symptoms including altered consciousness, seizures, and coma [1][6]. While specific antiviral therapies like acyclovir are highly effective for herpesvirus-induced encephalitis, many other encephalitis-causing viruses lack targeted treatments, necessitating a reliance on intensive supportive care and preventive vaccination strategies [3][8][9]. The high risk of permanent neurological sequelae or death makes these viruses a major focus of global public health and biodefense research [13][18].

Other names

Neurotropic virusViral encephalitis agentsJapanese encephalitis virus (JEV)West Nile virus (WNV)Tick-borne encephalitis virus (TBEV)Chandipura virus (CHPV)St. Louis encephalitis virus (SLEV)Herpes simplex virus (HSV)

Antiviral drugs primarily act by inhibiting viral nucleic acid synthesis; for instance, acyclovir targets viral DNA polymerase, while ribavirin can inhibit RNA-dependent RNA polymerase [3][9][10]. Supportive treatments like corticosteroids (e.g., dexamethasone) are used to reduce cerebral edema and the host's inflammatory response in the brain [1][6]. Vaccines provide immunity by inducing neutralizing antibodies against specific viral surface proteins [1][18].