Smallpox, Big Success
Humans were laid low by smallpox--
until vaccination turned the tide
Viruses and bacteria are formidable foes, and your body's immune system can't always win the war against them on its own. Fortunately, scientists have learned how the body's immune system actually works--and how we can further arm it with vaccines.
Vaccines are variants or derivatives of pathogenic microbes that cause the immune system to mount defenses to the pathogen itself. They've been so successful in boosting the body's defensive powers that they've virtually wiped out one of the greatest scourges humans have ever known: smallpox.
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