Introduction to World Primary Immunodeficiency Week
Primary Immunodeficiency (PI) is not a single disease but a group of conditions where a person’s immune system does not work properly from birth. Because the body’s natural defence against germs, bacteria, and viruses is weak or incomplete, people with PI tend to get infections more often and may take longer to recover.
World Primary Immunodeficiency Week began in 2011 and is observed every year from 22 to 29 April. It was launched through a global collaboration of patient organisations, doctors, and international immunology groups, including the International Patient Organisation for Primary Immunodeficiencies (IPOPI), European Society for Immunodeficiencies (ESID), and International Nursing Group for Immunodeficiencies (INGID). The aim is to raise awareness about primary immunodeficiency so that patients can be diagnosed earlier and receive timely treatment.
What is the Theme of World Primary Immunodeficiency Week 2026?
The 2026 theme for World Primary Immunodeficiency Week is “We Can’t Wait”. It highlights the urgent need for faster diagnosis and better care for people living with PI. The campaign mainly focuses on two groups who can bring real change: healthcare professionals, who need the right knowledge and tools to recognise symptoms early and diagnose patients with confidence, and policymakers, who can include PI in national health and rare disease policies. The goal is to ensure that important diagnostic tests and treatments are available and accessible to patients so they can receive timely care.
What is the History of World Primary Immunodeficiency Week?
The inaugural World PI Week was celebrated in 2011. It was born from a "Global Coalition" of major international health organizations and patient advocacy groups who realized that individual national efforts weren't enough to tackle the global lack of awareness.
The founding organizations included:
- IPOPI: International Patient Organisation for Primary Immunodeficiencies.
- ESID: European Society for Immunodeficiencies.
- INGID: International Nursing Group for Immunodeficiencies.
- Jeffrey Modell Foundation (JMF): A major global non-profit dedicated to PI research and advocacy (named after Vicki and Fred Modell’s son).
Each year, the week (celebrated April 22–29) focuses on a specific challenge:
- 2023: "Turning real-world data into knowledge" (Focus on research).
- 2024: "Access to care for all PID patients, everywhere."
- 2025: "See the Unseen" (Highlighting the "invisible" nature of the illness and delayed diagnoses).
The week is held at the end of April to coincide with April being National PI Awareness Month in several countries (like the US). It culminates on April 29th, which is often linked to the broader celebration of the International Day of Immunology.
What is Primary Immunodeficiency?
Primary Immunodeficiency is a group of inherited conditions in which parts of the immune system are absent or do not work as they should. Because the body’s natural defence system is weakened, it becomes harder to fight off everyday germs like bacteria, viruses, and fungi. This can lead to infections that occur more often, last longer, or become more severe than usual. With timely diagnosis and appropriate treatment, many people with PI can manage the condition effectively and lead healthy lives.
What are the Common Symptoms of Primary Immunodeficiency?
Primary Immunodeficiency can sometimes be difficult to recognise early because its symptoms often resemble common infections. However, when infections become unusually frequent, severe, or slow to heal, doctors may begin evaluating whether an underlying immune system disorder is present.
- Frequent infections such as ear infections, sinus infections, or pneumonia
- Infections that take longer than usual to recover from or keep coming back
- Recurrent stomach infections, diarrhoea, or poor weight gain in children
- The need for repeated courses of antibiotics to clear infections
- A family history of immune system disorders
- Unusual or severe infections caused by common germs
What are the Diagnosis and Testing Procedure for Primary Immunodeficiency?
Doctors usually begin with a detailed medical history and physical examination, focusing on patterns of infections and family history. If Primary Immunodeficiency is suspected, several tests may be recommended, including:
- Blood tests to measure levels of immune cells and antibodies
- Immunoglobulin testing to check whether the body is producing enough protective antibodies
- Genetic testing to identify inherited immune system defects
- Specialised immune function tests to see how well immune cells respond to infections
What are the Types of Primary Immunodeficiency Disorders?
Type of Disorder | What Happens in the Body | Common Examples |
Antibody (B-cell) Deficiencies | The body cannot produce enough antibodies, which normally help fight bacteria and viruses. This leads to frequent respiratory and sinus infections. | Common Variable Immunodeficiency (CVID), X-linked Agammaglobulinemia |
T-cell Deficiencies | T-cells, which coordinate immune responses and fight viruses and fungi, do not function properly. Patients may experience severe or persistent infections. | DiGeorge Syndrome |
Combined Immunodeficiencies | Both B-cells and T-cells are affected, causing a severely weakened immune system that struggles to fight many types of infections. | Severe Combined Immunodeficiency (SCID) |
Phagocytic Cell Defects | Certain white blood cells (phagocytes) cannot effectively destroy bacteria or fungi that enter the body. | Chronic Granulomatous Disease |
Complement Deficiencies | Problems occur in the complement system; a group of proteins that help antibodies destroy germs and support immune responses. | Complement Deficiency disorders |
What are the Causes and Risk Factors of Primary Immunodeficiency?
Primary Immunodeficiency is mainly caused by genetic mutations that affect the immune system’s ability to function normally. These mutations can interfere with the development or activity of immune cells such as B cells, T cells, or other protective components of the body. Most forms are inherited from parents, although some cases arise due to spontaneous genetic changes without a clear family history.
Key risk factors include:
- Family history of immunodeficiency disorders
- Genetic inheritance patterns, particularly X-linked or autosomal conditions
- Consanguineous marriages (marriage between close relatives), which increase the likelihood of inherited genetic disorders
- Delayed diagnosis, which can worsen complications from recurrent infections
How is Primary Immunodeficiency Treated and Managed?
While many forms of Primary Immunodeficiency cannot be permanently cured, modern treatments can effectively control symptoms and prevent complications. The goal is to strengthen the body’s defence system, prevent infections, and improve quality of life.
Common treatment approaches include:
- Immunoglobulin replacement therapy to provide the antibodies the body cannot produce
- Preventive antibiotics or antifungal medications to reduce recurrent infections
- Vaccination strategies tailored to the patient’s immune condition
- Regular monitoring and specialised care to detect and manage infections early
With proper treatment and long-term medical support, many individuals with PI can lead healthy and productive lives.
Which Awareness and Advocacy Issues Are Raised During World Primary Immunodeficiency Week?
World Primary Immunodeficiency Week focuses on increasing global understanding of Primary Immunodeficiency and improving access to diagnosis and treatment. Despite medical advances, many patients around the world remain undiagnosed or misdiagnosed for years.
Key advocacy themes include:
- Early diagnosis and screening to prevent severe infections and complications
- Improving awareness among healthcare professionals and the public
- Ensuring access to essential diagnostic tests and life-saving treatments
- Encouraging governments to include PI in national rare disease policies
- Supporting patients and families through education and community networks
These initiatives help ensure that patients receive timely care, appropriate treatment, and long-term support.
In What Ways Does Artemis Hospitals Provide Support for Individuals With Primary Immunodeficiency?
At Artemis Hospitals, patients with Primary Immunodeficiency receive comprehensive and multidisciplinary care tailored to their condition. The hospital focuses on early diagnosis, advanced treatment options, and long-term disease management.
Support services may include:
- Advanced diagnostic testing, including immune function assessments and genetic evaluation
- Immunoglobulin therapy and infection management programmes
- Access to bone marrow transplant and advanced treatment facilities when required
- Patient education and counselling to help families understand the condition and manage it effectively
Through a patient-centred approach and modern medical expertise, Artemis Hospitals aims to improve health outcomes and quality of life for individuals living with Primary Immunodeficiency.
Article by Dr. Sumeet Agrawal
Chief - Rheumatology & Clinical Immunology
