Primary immunodeficiency diseases are a group of more than 350 rare, chronic disorders in which part of the body’s immune system is missing or functions improperly. These diseases are caused by hereditary or genetic defects. Because one of the most important functions of the normal immune system is to protect against infection, people with primary immunodeficiency diseases commonly have an increased susceptibility to infection.


 

Disclaimer: These resources are regularly reviewed to ensure that links still work correctly and the resources listed continue to be helpful to our visitors. If you find that a link isn't working or information is incorrect or if you'd like to have your own organization listed here, please email infocenter@lls.org. Because we want to be sure that our visitors find the most relevant resources, we encourage you to visit the organization's website for more detailed information.