Immune Deficiency Foundation | 6,836 followers on LinkedIn. Improving the diagnosis, treatment, and quality of life of people affected by primary immunodeficiency. | The Immune Deficiency Foundation improves the diagnosis, treatment, and quality of life for every person affected by primary immunodeficiency.​ We foster a community that is connected, engaged, and empowered through advocacy, education, and research. Whether you've been recently diagnosed, have been living with a primary immunodeficiency (PI) for years, or just think you might have a PI, we are here to help.