A never-ending war is underway, and you are at the very center of the battle. In fact, it is taking place beneath your own skin.
Microscopic pathogens—such as deadly bacteria, viruses, fungi and parasites—may be so small they cannot be seen, but they are everywhere. And what stands between you and these threats, to keep you alive and healthy? One of the great marvels of God’s design: the human immune system.