We classify all of the body’s immune reactions into two types of immunity: innate and adaptive. Under each category are many players and thousands of complex systems. Right now, I just want to focus on these two categories.
Our body’s first line of response to an attack comes from the innate immune system (sometimes called the “natural” or “native” immune system. This system begins working against invaders immediately and up to about 12 hours into an invasion by a microbe. Often times, it’s even working before a microbe even comes into contact with the body.