![person studying](/sites/default/files/styles/large/public/understandingpi.jpg?itok=Zo3vrl11)
Learn about autoimmune symptoms in primary immunodeficiency (PI), which healthcare providers increasingly recognized as a common part of these disorders. This chapter is taken from the IDF Patient & Family Handbook for Primary Immunodeficiency Diseases, 6th Edition, copyright ©2019 by Immune Deficiency Foundation, USA.