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Overview

What Is Severe Congenital Neutropenia?

Severe congenital neutropenia is a group of rare, usually genetic disorders that are present from birth. The body has persistently very low levels of neutrophils, white blood cells that help fight bacterial and fungal infections. As a result, affected children may develop infections more easily and may become seriously ill without prompt treatment. The condition commonly affects infants and children, although it can continue throughout life.

Symptoms

Symptoms of Severe Congenital Neutropenia

  • Recurrent fever
  • Mouth sores (oral ulcers)
  • Sore throat
  • Inflamed or bleeding gums (gingivitis)
  • Skin infections
  • Ear infections (otitis media)
  • Pneumonia
  • Slow-healing wounds

Causes

Causes of Severe Congenital Neutropenia

Severe congenital neutropenia most often results from an inherited or newly occurring change in a gene that disrupts the development or survival of neutrophils in the bone marrow. Several different genes and inheritance patterns can be involved. In some people, testing does not identify a specific gene cause, even when the condition clearly fits the clinical pattern.

Inheritance and Genetic Counseling

The condition may be inherited from one or both parents, or it may arise spontaneously in a child without a previous family history. Genetic counseling can help families understand test results, possible risks to siblings or future children, and whether relatives should consider testing. A hematology or genetics team can recommend the most appropriate testing approach.

Risk Factors

Risk Factors for Severe Congenital Neutropenia

  • A known family history of severe congenital neutropenia can increase the likelihood of the condition.
  • Having a parent who carries a relevant gene change may increase a child’s inherited risk.
  • Having a previous child with congenital neutropenia may indicate a recurrence risk in the family.
  • Gene changes associated with congenital neutropenia are important non-modifiable risk factors.
  • A child may still develop the condition through a new gene change even when no family risk is known.

Complications

Complications of Severe Congenital Neutropenia

  • Bloodstream infection or sepsis
  • Pneumonia
  • Deep tissue infections
  • Bone infection (osteomyelitis)
  • Organ damage caused by a severe infection
  • Poor growth
  • Recurrent mouth or dental disease

Long-standing severe congenital neutropenia can also be associated with myelodysplastic syndrome or acute myeloid leukemia. These complications are uncommon, but regular specialist monitoring helps assess blood counts, treatment response, and bone marrow health.

Diagnosis

How Severe Congenital Neutropenia Is Diagnosed

  • Repeated complete blood counts with a differential measure neutrophil levels over time and help confirm persistent neutropenia.
  • A review of infection history, symptoms, family history, and medications helps identify patterns and possible contributing factors.
  • Additional testing may be used to rule out infections, immune disorders, nutritional problems, and other causes of neutropenia.
  • Genetic testing may be recommended when the clinical findings suggest an inherited form of congenital neutropenia.
  • A bone marrow examination may be needed to assess how neutrophils are developing and to exclude other blood or marrow disorders.

SPECIALIST CARE

Why specialist evaluation matters

Diagnosis usually requires evaluation by a pediatric hematologist or hematologist. Neutrophil counts can vary, and the specialist must exclude other inherited or acquired disorders that can cause low neutrophil levels.

Treatment & Management

Treatment and Management of Severe Congenital Neutropenia

Granulocyte Colony-Stimulating Factor

Granulocyte colony-stimulating factor, often called G-CSF, is usually the first-line treatment. It stimulates the bone marrow to produce more neutrophils and can reduce the risk of serious infections. The dose is individualized based on blood counts, infection history, treatment response, and ongoing specialist monitoring.

  • Prompt antibiotic or antifungal treatment is used when an infection is suspected.
  • Good dental and skin care can help reduce sources of infection.
  • Vaccinations should be given according to the plan developed with the specialist team.
  • Families may be advised about infection precautions, including when to seek urgent medical care for fever.
  • Regular blood-count monitoring helps guide treatment and track neutrophil response.
  • Hematopoietic stem cell transplantation may be considered for selected patients with poor treatment response, severe complications, or concerning bone marrow changes.

Outlook and Prognosis

Outlook and Prognosis

Outcomes for severe congenital neutropenia have improved substantially with G-CSF, prompt treatment of infections, and specialist follow-up. Prognosis varies according to the disease subtype, response to treatment, history of infections, and whether marrow complications develop. Ongoing care helps the medical team adjust treatment and identify problems early.

When Should You See a Doctor

When Should You See a Doctor?

SEEK URGENT CARE

Fever can be an emergency

Anyone known or suspected to have severe congenital neutropenia who develops a fever or signs of infection should receive immediate medical evaluation and follow the emergency plan provided by their hematology team. Urgent symptoms can include chills, unusual sleepiness, breathing difficulty, severe pain, confusion, or rapidly worsening symptoms.

  • Arrange a medical assessment for recurrent infections.
  • Seek evaluation for persistent or repeatedly returning mouth ulcers.
  • Discuss poor growth or difficulty gaining weight with a clinician.
  • Ask for assessment of unexplained low blood counts.
  • Arrange genetic or hematology evaluation if there is a family history of congenital neutropenia.

Tests & Procedure

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Symptoms

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  • Severe Congenital Neutropenia

    Fever