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Vaccines
Like the X-ray , the vaccine was discovered by chance . Doctor Edward Jenner invited his gardener ’ s son , James , for the first vaccine experiment : Jenner scratched the boy ’ s arm and applied a sample of cowpox , from another cowpox patient , onto the scratches . James became ill for a few days and recovered . Jenner then tested smallpox against the boy and James did not develop the disease . Jenner had created the first vaccine . healthcareglobal . com 125