The discovery of penicillin revolutionized health care. Prior to the 1940s, bacterial infections were often fatal. Since then, penicillin has saved countless lives by killing harmful bacteria. The men who recognized its potential and developed it for widespread use won a Nobel Prize in 1945.

Long before the discovery of penicillin, other silent killers were at work saving lives by destroying bacteria. These silent killers are white blood cells. These hard workers are God’s way of protecting us from disease. No one knows how many invasions they have stopped or how many lives they have saved. They receive little recognition for…