immunization # 10 Vaccination.docx - Vaccination Main...

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Vaccination Main articles: Smallpox vaccine and Edward Jenner In 1796, Edward Jenner, a doctor and scientist who had practiced variolation, performed an experiment based on the folk-knowledge that infection with cowpox, a disease with minor symptoms which was never fatal, also conferred immunity to smallpox.[10] The idea was not new; it had been demonstrated some years earlier by Benjamin Jesty, who had not publicized his discovery.[11] In 1798, Jenner extended his observations by showing that cowpox could be passed from a lesion on one patient to others through four arm to arm transfers and that the last in the series was immune by exposing him to smallpox.
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