Primary immunodeficiency disorders include more than 400 conditions, and a growing number of people are being recognized as having them as a result of improved diagnostic tools and greater awareness among physicians. Most treatments for these conditions are plasma-derived therapies sourced from donors. We spoke to Joerg Schuettrumpf, chief scientific innovation officer at Grifols, about the changing landscape for these conditions, the challenges of ensuring a reliable supply of plasma-derived therapies, and how treatment options may evolve.