There is no such thing as a contagious disease, nor is there such a thing as an immune system, per se. Sure, there are defenses inside the body which maintain health, but there is no mechanism that makes a person IMMUNE to disease. For instance, you cannot catch Type II Diabetes from anyone, but you can get it if your Cortisol levels are high for years from stress, and your adrenals are exhausted from being in fight-or-light constantly, triggering...