14. Immune System Diversity
A critical aspect of human survival is the remarkable diversity of immune system genes, especially the HLA (human leukocyte antigen) types. This diversity equips populations to recognize and combat a vast array of pathogens, making our immune defenses more adaptable.
Ongoing evolution continues to shape HLA gene variations as humans encounter new diseases and environmental challenges. The greater the diversity, the better our collective ability to resist emerging infections—a vital evolutionary advantage in our interconnected world. NIH resource