Definition

Noun: A rare, inherited disorder of the immune system characterized by a profound deficiency in both T lymphocytes and B lymphocytes, leading to an extremely compromised ability to fight infections. It is typically caused by genetic mutations and is fatal in early childhood without treatment.

Usage

• The newborn was diagnosed with severe combined immunodeficiency, requiring immediate isolation to prevent infection.
• Severe combined immunodeficiency is often called "bubble boy disease" due to the protective isolation used historically.
• Early detection of severe combined immunodeficiency through newborn screening is critical for a successful bone marrow transplant.

Advanced Usage

• As a medical acronym: The condition is commonly abbreviated as SCID in clinical and research contexts.
  • The hospital's immunology department specializes in treating SCID.
• In genetic context: Often specified by the underlying genetic defect, e.g., X-linked SCID or ADA-SCID.
  • The study focused on gene therapy for a specific form of severe combined immunodeficiency.

Variants and Related Words

• SCID (noun): The standard acronym for severe combined immunodeficiency.
• Immunodeficiency (noun): A broader term for any defect in the immune system's ability to protect the body.
• Primary immunodeficiency (noun): A category of inherited immune disorders that includes SCID.

Synonyms

• Bubble boy disease (noun, informal): A colloquial term derived from a famous case of a patient living in a sterile plastic bubble.
• Alymphocytosis (noun, technical): An older, less specific term indicating a lack of lymphocytes.

Notes on Meaning

This term refers exclusively to a specific, severe genetic condition. It is not used to describe acquired immunodeficiencies (like AIDS) or milder immune deficiencies. The core meaning combines the concepts of severity ("severe"), the involvement of multiple immune system branches ("combined"), and the fundamental nature of the defect ("immunodeficiency").

Noun

1. a congenital disease affecting T cells that can result from a mutation in any one of several different genes; children with it are susceptible to infectious disease; if untreated it is lethal within the first year or two of life