When viewing this topic in a different language, you may notice some differences in the way the content is structured, but it still reflects the latest evidence-based guidance.

Encephalitis

Última revisión: 2 Dec 2025
Última actualización: 23 Oct 2025

Resumen

Definición

Anamnesis y examen

Principales factores de diagnóstico

  • fever
  • rash
  • altered mental state
  • focal neurologic deficit
  • meningismus
  • parotitis
  • lymphadenopathy
  • optic neuritis
  • acute flaccid paralysis
  • movement disorder
Todos los datos

Otros factores de diagnóstico

  • cough
  • gastrointestinal infection
  • seizures
  • biphasic illness
  • autonomic and hypothalamic disturbances
  • myocarditis/pericarditis
  • jaundice
  • arthritis
  • retinitis
  • parkinsonism
Todos los datos

Factores de riesgo

  • age <1 or >65 years
  • immunodeficiency
  • vector exposure and/or animal bites
  • location
  • vaccination
  • postinfection
  • blood/body fluid exposure
  • organ transplantation
  • season
  • occupation
  • hunting/trekking in woods
  • swimming or diving in warm freshwater or nasal/sinus irrigation
  • spelunking (cave-exploring)
  • death in animals
  • cancer
Todos los datos

Pruebas diagnósticas

Primeras pruebas diagnósticas para solicitar

  • CBC
  • peripheral blood smear
  • serum electrolytes
  • liver function tests
  • blood cultures
  • throat swab
  • nasopharyngeal aspirate
  • chest radiography
  • CT brain
  • MRI brain
  • electroencephalogram (EEG)
  • cerebrospinal fluid (CSF) analysis
  • CSF culture
  • CSF serology
  • CSF polymerase chain reaction (PCR)
Todos los datos

Pruebas diagnósticas que deben considerarse

  • stool enteroviral culture
  • sputum culture
  • IgG and IgM antibodies (blood or CSF)
  • PCR (blood)
  • HIV serology/RNA test
  • CSF biomarkers/prion protein assay
  • paraneoplastic antibodies (blood and CSF)
  • abdominal/pelvic ultrasound
  • whole-body CT
  • whole-body PET scans
  • magnetic resonance spectroscopy
  • next-generation sequencing of CSF
  • brain biopsy
Todos los datos

Algoritmo de tratamiento

Inicial

immunocompetent host: suspected viral etiology

immunocompromised host: suspected viral etiology

Agudo

confirmed herpes simplex virus (HSV) encephalitis

confirmed varicella zoster virus (VZV) encephalitis

confirmed cytomegalovirus (CMV) encephalitis

confirmed Epstein-Barr virus (EBV) encephalitis

confirmed herpes B encephalitis

confirmed human herpes 6 encephalitis

confirmed nonherpes virus etiology

nonviral etiology

En curso

convalescent phase: all etiologies

Colaboradores

Autores

Sung G Ji, MD, PhD

Behavioral Neurology Fellow

Department of Neurology

University of Washington

Seattle

WA

Divulgaciones

SGJ declares that he has no competing interests.

Payal B. Patel, MD

Assistant Professor of Neurology

Department of Neurology

University of Washington

Seattle

WA

Divulgaciones

PBP has received research funding support from the National Institute of Health and Bayer Pharmaceuticals. PBP has received an honorarium as an author from Medlink Neurology and Continuum Neurology.

Agradecimientos

Dr Payal B. Patel would like to gratefully acknowledge Dr Leo H. Wang, Dr Louise T. Wang, Dr Catalina C. Ionita, Dr Manjunath Markandaya, Dr David Janicke, Dr Robert Schmidt, and Dr Kimiko Domoto-Reilly, previous contributors to this topic.

Divulgaciones

LHW, LTW, CCI, MM, DJ, RS, and KDR declare that they have no competing interests.

Revisores por pares

Alejandro Rabinstein, MD

Professor of Neurology

Mayo Clinic

Rochester

MN

Divulgaciones

AR has participated in advisory board meetings for Astra Zeneca, Chiesi, and Shionogi.

Rodrigo Hasbun, MD, MPH, FIDSA

Professor of Medicine

UT Health McGovern Medical School

Houston

TX

Divulgaciones

RH has received research support and personal fees from Biomeriaux (Biofare Diagnostics).

Russel Dale, MBChB, MRCPCH, MSc, PhD

Professor of Paediatric Neurology

The University of Sydney

Consultant Neurologist

The Children's Hospital at Westmead

Sydney

Australia

Declarações

RD declares that he has no competing interests.

Créditos aos pareceristas

Os tópicos do BMJ Best Practice são constantemente atualizados, seguindo os desenvolvimentos das evidências e das diretrizes. Os pareceristas aqui listados revisaram o conteúdo pelo menos uma vez durante a história do tópico.

Declarações

As afiliações e declarações dos pareceristas referem--se ao momento da revisão.

Referências

Nossas equipes internas de editoria e de evidências trabalham em conjunto com colaboradores internacionais especializados e pares revisores para garantir que forneçamos acesso às informações o mais clinicamente relevantes possível.

Principais artigos

Venkatesan A, Tunkel AR, Bloch KC, et al. Case definitions, diagnostic algorithms, and priorities in encephalitis: consensus statement of the International Encephalitis Consortium. Clin Infect Dis. 2013 Oct;57(8):1114-28.Texto completo  Resumo

Solomon T, Michael BD, Smith PE, et al. Management of suspected viral encephalitis in adults--Association of British Neurologists and British Infection Association National Guidelines. J Infect. 2012 Apr;64(4):347-73.Texto completo  Resumo

Miller JM, Binnicker MJ, Campbell S, et al. Guide to utilization of the microbiology laboratory for diagnosis of infectious diseases: 2024 update by the Infectious Diseases Society of America (IDSA) and the American Society for Microbiology (ASM). Clin Infect Dis. 2024 Mar 5:ciae104.Texto completo  Resumo

Kneen R, Michael BD, Menson E, et al. Management of suspected viral encephalitis in children - Association of British Neurologists and British Paediatric Allergy, Immunology and Infection Group national guidelines. J Infect. 2012 May;64(5):449-77.Texto completo  Resumo

Artigos de referência

Uma lista completa das fontes referenciadas neste tópico está disponível para os usuários com acesso total ao BMJ Best Practice.
  • Encephalitis images
  • Diagnósticos diferenciais

    • Viral meningitis
    • Encephalopathy (toxic/metabolic)
    • Status epilepticus
    Mais Diagnósticos diferenciais
  • Diretrizes

    • Guide to utilization of the microbiology laboratory for diagnosis of infectious diseases
    • Canadian consensus guidelines for the diagnosis and treatment of autoimmune encephalitis in adults
    Mais Diretrizes
  • Folhetos informativos para os pacientes

    Meningitis and septicemia

    Lumbar puncture

    Mais Folhetos informativos para os pacientes
  • padlock-lockedConectar-se ou assinar para acessar todo o BMJ Best Practice

O uso deste conteúdo está sujeito ao nosso aviso legal