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AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
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3 ene 1796 año - First vaccine discovered and used - Edward Jenner used a cowpox vaccine on 13 year old boy.
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Medical Discoveries
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shannon
13 oct 2021
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fecha:
3 ene 1796 año
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~ 229 years ago
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