What are Inborn Errors of Immunity (IEI) and what should be done if you suspect them? Dr. Bharat Kumar, clinical rheumatologist and allergy immunologist, joins us to lend his insights on what they are, how to identify them in our patients, the challenges in diagnosing them, and how they manifest in a clinical setting. Dr. Kumar also explains how IEI's are caused, their overlap with rheumatic diseases and recent advancements in treatments.