Biology, 27.01.2021 21:40, chantelljenkins2
Smallpox is caused by a virus that infects people causing painful sores. Jenner performed his smallpox vaccine experiment in 1796. Using your knowledge of the immune system and vaccines explain how humans were able to get rid of this disease in the human population by 1980.
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Smallpox is caused by a virus that infects people causing painful sores. Jenner performed his smallp...
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