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A person crucial factor was a scientific comprehension about the virus itself. Virologists experienced arrive at believe that variola could endure and replicate only within human beings. Several viruses that trigger sickness in human beings may infect animals — visualize Jenner’s cowpox. But variola experienced missing the opportunity to survive https://single-bookmark.com/story16906294/the-culture-of-the-united-states-diaries

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