Countless lives were saved from the ravages of diseases such as polio and small pox.
To protect you against small pox or diphtheria, you are vaccinated with a small amount of the toxin, and then your body develops immunity against that toxin.
In years gone by, many children were afflicted with polio, measles, mumps, Rubella, influenza, small pox, diphtheria, whooping cough and others.
A recent small pox epidemic and the threat of attack by warring tribes created a fertile ground for fear and suspicion.
