side by side comparison

Meningitis vs Encephalitis: Meninges vs Brain Parenchyma — Overlap and Distinctions

Fever, headache, and altered LOC appear in all three — but choosing droplet precautions versus seizure precautions, or antibiotics versus antivirals, depends on whether you're dealing with inflamed meninges or infected brain tissue. Mix them up and you delay life-saving treatment.

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Comparison

Side-by-side3 compared
Comparevs
Dimension
Bacterial Meningitis
Viral Meningitis
Encephalitis
Pathophysiology & cause
  • Inflamed meninges
  • N. meningitidis, S. pneumoniae
  • Rapid, fulminant onset (hours)
  • Inflamed meninges
  • enteroviruses, HSV
  • Gradual, milder onset (days)
  • Infected brain parenchyma
  • HSV-1 most common
  • Gradual, progressive neuro decline
Signs & symptoms
  • Nuchal rigidity + Kernig/Brudzinski
  • Fever, severe headache, photophobia
  • Nuchal rigidity milder
  • +/− Kernig
  • Fever, headache, milder course
  • ★Personality change, agitation, seizures
  • Focal deficits: hemiparesis, aphasia
CSF & diagnostics
  • ★CSF: ↓ glucose, ↑ neutrophils
  • Cloudy/turbid
  • ↑ protein
  • CSF: ↑ lymphocytes, normal glucose
  • Clear
  • mildly ↑ protein
  • CSF: ↑ lymphocytes, normal glucose
  • RBCs in HSV
  • EEG/MRI changes
Isolation & priorities
  • Droplet precautions until 24 hr antibiotics
  • Seizure precautions
  • monitor ↑ ICP/level of consciousness
  • Standard precautions
  • Comfort, hydration, monitor neuro
  • Standard precautions
  • Seizure precautions
  • monitor ↑ ICP/level of consciousness
Treatment urgency & meds
  • ★Antibiotics within 1 hr — don't wait for CSF
  • Ceftriaxone + vancomycin ± dexamethasone
  • Supportive
  • usually self-limiting
  • Analgesics, antipyretics, fluids
  • ★IV acyclovir ASAP for HSV
  • Anticonvulsants for seizures
Patient teaching
  • Contacts need prophylaxis
  • vaccine prevents
  • Rest, fluids
  • symptoms resolve in 1–2 wk
  • Report personality/behavior changes early
Red flags — escalate
  • Petechial/purpuric rash then meningococcemia
  • ↓ level of consciousness, signs of ↑ ICP
  • Worsening LOC then reassess for bacterial/HSV
  • New seizures, focal deficits, ↓ level of consciousness
Complications
  • Sepsis, DIC, hearing loss, ↑ ICP
  • Usually full recovery
  • rare residual
  • Permanent neuro deficits, cognitive loss
Pathophysiology & cause

Bacterial Meningitis

  • Inflamed meninges
  • N. meningitidis, S. pneumoniae
  • Rapid, fulminant onset (hours)

Viral Meningitis

  • Inflamed meninges
  • enteroviruses, HSV
  • Gradual, milder onset (days)
Signs & symptoms

Bacterial Meningitis

  • Nuchal rigidity + Kernig/Brudzinski
  • Fever, severe headache, photophobia

Viral Meningitis

  • Nuchal rigidity milder
  • +/− Kernig
  • Fever, headache, milder course
CSF & diagnostics

Bacterial Meningitis

  • ★CSF: ↓ glucose, ↑ neutrophils
  • Cloudy/turbid
  • ↑ protein

Viral Meningitis

  • CSF: ↑ lymphocytes, normal glucose
  • Clear
  • mildly ↑ protein
Isolation & priorities

Bacterial Meningitis

  • Droplet precautions until 24 hr antibiotics
  • Seizure precautions
  • monitor ↑ ICP/level of consciousness

Viral Meningitis

  • Standard precautions
  • Comfort, hydration, monitor neuro
Treatment urgency & meds

Bacterial Meningitis

  • ★Antibiotics within 1 hr — don't wait for CSF
  • Ceftriaxone + vancomycin ± dexamethasone

Viral Meningitis

  • Supportive
  • usually self-limiting
  • Analgesics, antipyretics, fluids
Patient teaching

Bacterial Meningitis

  • Contacts need prophylaxis
  • vaccine prevents

Viral Meningitis

  • Rest, fluids
  • symptoms resolve in 1–2 wk
Red flags — escalate

Bacterial Meningitis

  • Petechial/purpuric rash then meningococcemia
  • ↓ level of consciousness, signs of ↑ ICP

Viral Meningitis

  • Worsening LOC then reassess for bacterial/HSV
Complications

Bacterial Meningitis

  • Sepsis, DIC, hearing loss, ↑ ICP

Viral Meningitis

  • Usually full recovery
  • rare residual

★ marks the fact that sets a column apart.

Clinical Pearl

Stiff neck + positive Kernig = meningitis; personality change + seizures = encephalitis — location tells the story.

Component Topics

Meningitis

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