Prevalence
Prevalence
Around 6 million people worldwide are estimated to have a PID, but between 70% and 90% of these are undiagnosed. It is estimated that about 5,000 individuals within the UK suffer from PID disorder.
PID can present in infancy, childhood, or adulthood, depending on the specific genetic mutation or protein defect. Most PIDs are diagnosed in later life, even though some can be detected in infancy or childhood. Diagnosing PID requires good clinical awareness and specialized laboratory testing, and early diagnosis may help reduce morbidity and mortality.5
Signs and symptoms
Several signs can lead a clinician to suspect an immunodeficiency. They are often diagnosed after “too many infections”. Due to the defects in their immune systems, people with PID are more prone to infections caused by microorganisms such as bacteria, viruses, fungi and protozoa. In addition, a poorly regulated immune system can lead to autoimmunity. PID should be considered in patients with severe, persistent, recurrent, or unusual infections (SPUR for short).