One day a boy named Johnny was in his room when suddenly an unknown sickness crept into his body, somehow making it past his nose hair, mucus, and skin, which are the body's first lines of non-specific defense.
Johnny knew he was sick because he felt imflammation in his tummy and throat.
Johnny's immune system knew it was time to FIGHT BACK!!!
Johnny's specific defense mechanisms fought long and hard, for days on end.....
The b-cells, antibodies, t-cells, and phagocytes, fought long and hard to fight off the infectious agent.
Johnny's immune system did it!! It killed the infectious agent!!