April 22-29 is World PI Week – a week to raise awareness about primary immunodeficiency diseases. There are more than 450 types and patients are vulnerable to serious infections.

It’s World PI Week. Patients who have this immune system problem often face a long road to diagnosis.
April 22-29 is World PI Week – a week to raise awareness about primary immunodeficiency diseases. There are more than 450 types and patients are vulnerable to serious infections.