Written by:Fact check:

Overview

What Are Innate Immunity Disorders?

Innate immunity disorders are a group of conditions that affect the body’s early defenses against infection and injury. These defenses include phagocytes, complement proteins, natural killer cells, and inflammatory signaling. Many of these disorders are inherited and may first appear in childhood, while others are recognized in adulthood. Problems with these defenses can lead to repeated infections, unusual inflammation, or difficulty recovering from illness.

Symptoms

Symptoms of Innate Immunity Disorders

Symptoms vary according to the part of innate immunity that is affected. They may include repeated infections, unusual inflammation, or poor wound healing.

  • Recurrent bacterial or fungal infections
  • Infections that are unusually severe or difficult to treat
  • Persistent fever
  • Skin or organ inflammation
  • Swollen lymph nodes or an enlarged spleen
  • Delayed wound healing
  • Unexplained episodes of inflammation

Causes

Causes of Innate Immunity Disorders

Many innate immunity disorders result from changes in genes needed for immune-cell development, recognition of microbes, complement activity, inflammatory signaling, or the ability of immune cells to kill microbes. Some conditions are inherited from one or both parents. Others may result from acquired immune dysfunction caused by another disease, treatment, or medical problem.

Affected defenseWhat it normally doesPossible consequence
Phagocyte functionEngulfs and destroys microbesRecurrent bacterial or fungal infections
Complement systemMarks and helps destroy certain microbesIncreased susceptibility to selected bacterial infections
Natural killer cell functionRecognizes and eliminates infected or abnormal cellsCertain viral or other recurrent infections
Inflammatory signalingCoordinates the early immune responseExcessive or poorly controlled inflammation

Risk Factors

Risk Factors for Innate Immunity Disorders

Inherited and family-related factors

  • A parent, sibling, or child with an immune deficiency
  • A known disease-causing genetic variant
  • Consanguinity or a family history suggestive of inherited disease
  • Recurrent severe infections beginning in infancy or childhood
  • A personal or family history of unexplained inflammatory disease

Acquired or medical factors

  • Certain blood or bone marrow disorders
  • Treatments that suppress immune-cell production or function
  • Persistent or unusual infections in a person with another condition that affects immunity

Complications

Complications of Innate Immunity Disorders

  • Severe or recurrent infections
  • Bloodstream infection or sepsis
  • Organ damage from repeated infection
  • Chronic lung disease or bronchiectasis
  • Persistent inflammatory damage
  • Autoimmune features in some disorders
  • Growth or developmental effects in children
  • Emotional or practical effects of frequent illness

Complication risk depends on the specific immune pathway, the type of infection, age at diagnosis, and access to preventive and specialist care.

Seek urgent care

Severe infection can become an emergency

Seek urgent medical care for trouble breathing, confusion, fainting, rapidly worsening illness, dehydration, or a high-risk fever.

Diagnosis

How Innate Immunity Disorders Are Diagnosed

Diagnosis usually begins with a detailed personal and family history, a physical examination, and a review of infection-causing organisms and responses to treatment. Clinicians also assess symptoms of inflammation and look for patterns that suggest a problem with early immune defenses.

  • Complete blood count with immune-cell counts
  • Tests of neutrophil or phagocyte function when indicated
  • Complement activity and component testing
  • Inflammatory markers and organ-function tests
  • Microbiology testing during infections
  • Targeted or broad genetic testing when an inherited disorder is suspected

Treatment & Management

Treatment and Management of Innate Immunity Disorders

Management depends on the specific disorder, its severity, the person’s age, the affected immune pathway, and whether the condition is inherited or acquired. Treatment may focus on preventing and treating infections, controlling inflammation, and correcting the immune problem when possible.

  • Prompt, culture-guided treatment of infections
  • Preventive antimicrobial medicines for selected patients
  • Vaccinations when appropriate and safe
  • Medicines that stimulate or replace particular immune functions when indicated
  • Anti-inflammatory or targeted immune medicines for excessive inflammation
  • Treatment of underlying acquired causes
  • Hematopoietic stem cell transplantation for selected severe disorders

Outlook and Prognosis

Outlook and Prognosis

Innate immunity disorders range from mild conditions with occasional infections to severe disorders requiring intensive treatment. Prognosis depends on the affected pathway, infection burden, inflammatory complications, treatment response, and age at diagnosis.

  • Early recognition
  • An individualized infection action plan
  • Appropriate preventive treatment
  • Regular specialist monitoring
  • Prompt treatment of infections
  • Screening for organ or inflammatory complications

When Should You See a Doctor

When Should You See a Doctor?

Arrange a medical evaluation for repeated or unusually severe infections, infections caused by uncommon organisms, poor response to standard treatment, persistent inflammation, or a family history of an inherited immune disorder.

Get medical help

Do not wait for severe infection signs

Seek urgent care for trouble breathing, blue or gray lips, confusion, fainting, severe dehydration, rapidly worsening infection, or other signs of sepsis. People with known immune disorders may need earlier medical advice for fever or infection symptoms.

Branches

1 topic

Tests & Procedure

4 topics

Symptoms

1 topic

  • Innate Immunity Disorders

    Fever