Guillain‑Barré Syndrome: Peak Incidence in Adults 20‑40 Years Old

Guillain‑Barré syndrome (GBS) can occur at any age, but incidence peaks in young adulthood (20–40 years). Rates decline after 40, with a smaller secondary rise in older adults (>60).

Age‑Specific Notes

• Children: Rare; often post‑infectious (Campylobacter, Mycoplasma); generally better recovery.
• Adults 20‑40: Highest incidence; often preceded by Campylobacter jejuni, CMV, EBV, Zika, or vaccines (rare).
• Older Adults: Higher morbidity/mortality; more comorbidities, slower recovery, greater need for ICU/ventilation.

Clinical Pearl

Any age with acute flaccid weakness + areflexia → urgent neurology referral; IVIG or plasma exchange within 2–4 weeks of onset improves outcomes.