S1 • E22 May 19, 2004 26m
When people are born with a faulty immune system, they are said to have a Primary Immunodeficiency. PI diseases were once thought to be rare, mostly because only the more severe forms were recognized. Today physicians realize that PIs are not uncommon. They can occur in teenagers and adults as often as in infants and children. Because of advances in our medical understanding and treatment, individuals who would not have survived childhood are now able to live normal lives.
