At what ages does severe combined immunodeficiency (SCID) typically first present?

Updated: Apr 28, 2021
  • Author: Robert A Schwartz, MD, MPH; Chief Editor: Harumi Jyonouchi, MD  more...
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The great majority of SCID cases present in patients younger than 3 months (average age at symptom onset, 2 months; mean age at diagnosis, 6.5 months). Patients with ADA-deficient SCID seem to have less severe mutations; some are not identified until adulthood. Patients with common γ chain mutation may reveal less severe mutations and present in the second year of life but this occurs rarely. Finnish patients with cartilage-hair hypoplasia may survive until later childhood or adulthood when cancer becomes an increased risk.

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