Human life expectancy, particularly in developed countries, wouldn't be nearly as good without the presence of vaccinations. They're the most important inventions in human history, as they've saved countless lives worldwide by preventing infectious diseases. The first vaccines were created centuries ago using primitive knowledge and ideas of medicine and the human body. As we've evolved, so have the outcomes of experimentation, bringing forth solutions for polio, measles, smallpox and several other debilitating and fatal diseases..............................
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