17964 Primary Immunodeficiency

Overview

Primary immunodeficiency (also called PI or PID) is a group of conditions that make it harder for your body to fight germs. People with PI may get many infections, severe infections, or infections that last longer than usual.

Primary immunodeficiency is considered rare, but specialists believe it is more common than previously thought. Recent studies estimate it may affect around 1 in 1,000 to 1 in 2,000 people, though many cases are still not diagnosed.

Primary immunodeficiency can affect anyone of any age or gender. Some forms are found in infants and young children, while others first appear in teenagers or adults.

Symptoms

Common symptoms

• Frequent infections, such as ear infections, sinusitis, bronchitis, or pneumonia
• Infections that keep coming back despite treatment
• Unusually severe infections that require hospital care
• Infections caused by germs that usually don't cause disease in healthy people
• Slow healing or poor response to infection treatment

Symptoms in children

• Repeated infections, especially ear and chest infections
• Failure to gain weight or grow at expected rate
• Deep abscesses (collections of pus) in organs or under the skin
• Need for intravenous (IV) antibiotics to clear infections
• Family history of serious infections or early death from infection

Symptoms in older adults

• New or repeated infections, sometimes after a health event like shingles or a respiratory virus
• Autoimmune-like symptoms, such as joint pain or low blood counts, that come from the immune system attacking the body
• Unusual or chronic diarrhea, fatigue, or weight loss
• Persistent skin or nail infections

Causes

Main causes

• Damage or changes in genes that control the immune system
• These gene changes are often inherited from one or both parents
• Occasionally, a gene change happens randomly without a family history

Risk factors

• A family history of primary immunodeficiency
• Having a sibling with the condition
• Parents who are blood relatives, which can raise the chance of rare genetic conditions

When to see a doctor

See a doctor urgently if:

• Frequent infections (for example, two or more pneumonias in a year, or four or more ear infections in a year)
• Infections that do not clear with normal treatment
• Infection complications, such as a lung abscess or bone infection

Book a routine appointment if:

• Talk to your doctor if you or your child keeps getting sick, especially if infections are severe or last a long time.
• Mention any family history of immune problems.

Diagnosis

A primary care doctor will usually start by asking about your medical history, family history, and symptoms. They will likely order blood tests to check the number and function of your immune cells and antibodies. If tests suggest a problem, they will refer you to a specialist in immunology.

Tests that may be done

• Complete blood count (CBC) to check for low levels of white blood cells, especially lymphocytes
• Blood tests for immunoglobulins (antibodies) – the proteins that fight infection
• Immunoglobulin G/A/M/E levels (specific types of antibodies)
• Vaccine response testing – checking how much antibody your body makes after a vaccine
• Complement function tests – checking proteins that help destroy germs
• Genetic testing – searching for gene changes linked to primary immunodeficiency

What to expect at your appointment

Diagnosis can take time because the symptoms may look like common childhood illnesses. The specialist may need to repeat some tests over several months. You may also be referred to a clinical geneticist, and family members may be offered testing if a genetic cause is found.

Treatment

Treatment is not a cure for most types of primary immunodeficiency, but it can greatly reduce infections and improve quality of life. The main goals are to replace missing parts of the immune system, treat infections early, and prevent complications.

Self-care at home

• Wash hands often with soap and water for at least 20 seconds
• Avoid large crowds during peak cold and flu season
• Keep up to date with recommended vaccinations, but ask your immunologist which vaccines are safe for you
• Stay close to home if you feel unwell

Medical treatments

Depending on the type and severity, treatments may include: immunoglobulin replacement therapy, where antibodies are given to boost your own defences; regular antibiotic or antifungal medicines to prevent or treat infections; and medicines called growth factors that help your bone marrow make white blood cells. In severe cases, a stem cell transplant (also called a bone marrow transplant) may be considered to rebuild a healthier immune system. Your immunologist will explain the options that fit your specific diagnosis.

When is surgery considered?

Surgery is not a usual part of treatment for primary immunodeficiency. In certain rare, serious infections, an abscess may need to be drained by a surgeon. If you need a stem cell transplant, this is not a surgical operation, but you will be cared for by a specialist transplant team.

Living with this condition

Living with primary immunodeficiency often means paying closer attention to your health and environment. It helps to create a network of doctors, nurses, and family who understand your condition. Many people learn to recognise early signs of infection so they can act quickly.

Lifestyle tips

• Avoid cigarette smoke and fumes, which can irritate your lungs
• Get enough sleep to help your body recover
• Manage stress with relaxation, hobbies, or talking to someone you trust
• Call your doctor sooner rather than later when you develop signs of infection

Diet and exercise

Eat a balanced diet with plenty of fruits, vegetables, wholegrains, and lean proteins. Exercise helps your lungs and circulation, but it needs to be gentle when you are feeling well. Always ask your doctor before starting a new exercise or diet routine.

Mental health and emotional wellbeing

Living with a lifelong condition can cause worry, isolation, and low mood. It is normal to feel frustrated or scared at times. Talk to your care team about how you are feeling; they can help you find counselling or peer support.

Prevention

You cannot prevent primary immunodeficiency because it is genetic. However, you can reduce the number of infections by avoiding germs, staying vaccinated, and following a personalised care plan.

Vaccines

Some vaccines are safe and recommended for people with PI, while others are not. For example, live vaccines (such as the nasal flu spray or MMR) may be unsafe for a severely weakened immune system. Always ask your immunologist before having any vaccine.

Screening programmes

Newborn screening for some types of severe primary immunodeficiency is becoming more common in many parts of the world. If you have a family history, genetic testing and genetic counselling can help you understand the risks for your children.

Complications

If left untreated

• Repeated infections can damage your lungs, ears, and other organs
• Severe infections such as sepsis (blood poisoning) can become life-threatening
• Some forms increase the risk of autoimmune diseases or certain cancers, such as lymphoma

Long-term outlook

With early diagnosis and modern care, many people with primary immunodeficiency live fulfilling, long lives. Treatments continue to improve, and most people can manage their condition at home with support from their healthcare team. If you have concerns, talking openly with your specialist can help you find the right plan for you.

Find support

International organisations

• International Patient Organisation for Primary Immunodeficiencies (IPOPI) ↗
• Immune Deficiency Foundation ↗

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