Hyperimmunes are Alphas with heightened immunities.
The immune system is a system of biological structures and processes within an organism that protects against disease. To function properly, an immune system must detect a wide variety of agents, known as pathogens, from viruses to parasitic worms, and distinguish them from the organism's own healthy tissue. In many species, the immune system can be classified into subsystems, such as the innate immune system versus the adaptive immune system, or humoral immunity versus cell-mediated immunity.
Hyperimmune Alphas have immune systems that are far more powerful in function than those of normal people. With that, they can both ingest substances or stay in environments featuring elements that an average person cannot survive from. This also accounts for their extended lifespans, as their bodies constantly purge itself of oxidants and toxin that shorten longevity