Encephalitis

Organism

Encephalitis

Arboviruses (California encephalitis group, St. Louis encephalitis, eastern and western equine encephalitis, West Nile virus, Japanese encephalitis virus in summer and fall), enteroviruses (coxsackie, echo, polio), HSV (10–20%), Bartonella henselae , lymphocytic choriomeningitis virus, tick-borne encephalitis virus, measles, rubella, VZV, HHV-6, rabies (Central and South America, India, Africa), Nipah virus (Malaysia), Chikungunya virus (India and Nepal), Creutzfeldt-Jakob.

Immunocompromised: CMV, VZV, EBV, West Nile virus, JC virus, HIV, Toxoplasma gondii.

Note the increasing recognition of antibody-mediated autoimmune encephalitis as cause of acute encephalitis. In studies of acute encephalitis, 40–50% of patients had infectious cause, 20% had immune-mediated cause including anti-NMDAR (N-methyl-D-asparte receptor) encephalitis and anti-voltage-gated potassium channel (VGKC) encephalitis, and 30% remained of unknown cause.

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