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Living with Combined immunodeficiency due to MALT1 deficiency

A rare inherited immune condition with slow growth, repeated lung infections and bowel inflammation starting in infancy.

Understanding Combined immunodeficiency due to MALT1 deficiency

Combined immunodeficiency due to MALT1 deficiency is a rare inherited form of primary immunodeficiency that starts in infancy.

Babies grow slowly and have early repeated lung infections that can lead to widened airways (bronchiectasis). People can also have inflammation of the digestive tract, rash, dermatitis and skin infections.

Signs & symptoms

Symptoms vary from person to person. GARD lists these among the most common:

  • Repeated bacterial and viral infections
  • Repeated chest infections
  • Widened airways in the lungs (bronchiectasis)
  • Slow growth and short stature
  • Skin rash
  • Finger and toe clubbing

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Specialists who may be involved include allergy and immune system specialists and genetic specialists.

  3. Consider genetic testing

    Changes in MALT1 are linked to this condition. Genetic testing and counseling can help confirm a diagnosis and explain what it means for your family.

  4. Connect with expert centers

    Immune Deficiency Foundation may keep lists of experts for this condition.

Care & treatment

Care team
Allergy and immune system specialists (allergists / immunologists); Genetic specialists (geneticists)
Expert care
Expert lists: Immune Deficiency Foundation
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with Immune Deficiency Foundation
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
Should we have genetic testing for the MALT1 gene?
How can we protect the lungs from infections?
Which specialists should help with digestive symptoms?

Quick facts

Symptoms usually startInfant
InheritanceAutosomal Recessive
GenesMALT1

Changes in the MALT1 gene are listed. It is autosomal recessive, so a child inherits a changed copy from each parent.

Genetic

Also known as: immunodeficiency 12; immunodeficiency type 12

Patient organizations

Broader rare-disease groups

Source: NIH GARD · Combined immunodeficiency due to MALT1 deficiencyGARD ID 17647 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

Perspectives from people navigating life with Combined immunodeficiency due to MALT1 deficiency.

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