Dr. Robert Silverman, author of "Immune Reboot: Maximizing Immunity, Restoring Gut Health, and Optimizing Vitality," provides a comprehensive primer on the immune system. He explains how lifestyle factors—diet, sleep, exercise, and stress—impact immune resilience. He offers specific protocols for optimizing resistance to Covid, what to do if you come down with it, and how to treat Long Covid, as well as how to prepare for vaccines.