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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
Focus
Comparevs
Dimension
Bacterial Meningitis
Viral Meningitis
Encephalitis
Pathophysiology & cause
  • Inflamed meninges
  • N. meningitidis, S. pneumoniae
  • Rapid, fulminant onset (hours)
  • Inflamed meninges
  • Enteroviruses (most common)
  • Gradual, milder onset (days)
  • Inflamed brain parenchyma
  • HSV-1 most common
  • Progressive neuro decline over days
Signs & symptoms
  • Nuchal rigidity + Kernig/Brudzinski
  • High fever, severe headache
  • Photophobia
  • Milder nuchal rigidity
  • Photophobia
  • Fever, headache, milder course
  • ★Personality change, agitation, seizures
  • Focal deficits: hemiparesis, aphasia
CSF & diagnostics
  • ★CSF: ↓ glucose, ↑ neutrophils
  • Cloudy/turbid CSF
  • Markedly ↑ protein
  • CSF: ↑ lymphocytes, normal glucose
  • Clear CSF
  • Mildly ↑ protein
  • CSF: ↑ lymphocytes, normal glucose
  • Clear CSF
  • RBCs in CSF (HSV)
  • Abnormal EEG/MRI
  • Mildly ↑ protein
Isolation & priorities
  • Droplet until 24 hr on antibiotics
  • Seizure precautions
  • Monitor LOC for ↑ ICP
  • Standard precautions
  • Comfort care: dark room, fluids
  • Standard precautions
  • Seizure precautions
  • Monitor LOC for ↑ ICP
Treatment urgency & meds
  • ★Antibiotics within 1 hr; don't delay for LP
  • Ceftriaxone + vancomycin
  • Dexamethasone with 1st antibiotic dose
  • Supportive care only
  • Usually self-limiting
  • Analgesics, antipyretics, fluids
  • ★IV acyclovir ASAP for HSV
  • Anticonvulsants for seizures
Patient teaching
  • Close contacts: prophylaxis
  • Vaccines prevent (MenACWY, PCV, Hib)
  • Rest, fluids
  • Symptoms resolve in 1–2 wk
  • Report personality/behavior changes early
Red flags — escalate
  • Petechial rash (meningococcemia)
  • ↓ LOC, signs of ↑ ICP
  • Worsening LOC: rule out bacterial/HSV
  • New seizures, focal deficits
  • ↓ LOC, signs of ↑ ICP
Complications
  • Sepsis, DIC, hearing loss, ↑ ICP
  • Usually full recovery
  • Permanent neuro deficits, cognitive loss
Pathophysiology & cause

Bacterial Meningitis

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

Viral Meningitis

  • Inflamed meninges
  • Enteroviruses (most common)
  • Gradual, milder onset (days)
Signs & symptoms

Bacterial Meningitis

  • Nuchal rigidity + Kernig/Brudzinski
  • High fever, severe headache
  • Photophobia

Viral Meningitis

  • Milder nuchal rigidity
  • Photophobia
  • Fever, headache, milder course
CSF & diagnostics

Bacterial Meningitis

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

Viral Meningitis

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

Bacterial Meningitis

  • Droplet until 24 hr on antibiotics
  • Seizure precautions
  • Monitor LOC for ↑ ICP

Viral Meningitis

  • Standard precautions
  • Comfort care: dark room, fluids
Treatment urgency & meds

Bacterial Meningitis

  • ★Antibiotics within 1 hr; don't delay for LP
  • Ceftriaxone + vancomycin
  • Dexamethasone with 1st antibiotic dose

Viral Meningitis

  • Supportive care only
  • Usually self-limiting
  • Analgesics, antipyretics, fluids
Patient teaching

Bacterial Meningitis

  • Close contacts: prophylaxis
  • Vaccines prevent (MenACWY, PCV, Hib)

Viral Meningitis

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

Bacterial Meningitis

  • Petechial rash (meningococcemia)
  • ↓ LOC, signs of ↑ ICP

Viral Meningitis

  • Worsening LOC: rule out bacterial/HSV
Complications

Bacterial Meningitis

  • Sepsis, DIC, hearing loss, ↑ ICP

Viral Meningitis

  • Usually full recovery

★ 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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