Jeffrey Modell Foundation website does an excellent job explaining PI and is very user friendly. Check them out!
What is Primary Immunodeficiency (PI)? PI is an umbrella term that encompasses a group of more than 350 defects of the immune system with varying degrees of severity. They occur when one or more essential parts of the immune system do not work correctly. #JMF #info4pi #PrimaryImmunodeficiency http://info4pi.org/information-booth/encyclopedia/about-piShare this post to help teach the world about PI!