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It all started with an observation. Edward Jenner, an English physician, observed that milkmaids who contracted cowpox were rarely victims of smallpox epidemic, a disease that in?icted a heavy toll on humankind with an estimate of 500 million victimsworldwide.In1796, Jennerinoculatedtheextracted?uidfromblistersonthe handofamilkmaidwhowasinfectedwithcowpoxintothearman8yearoldpeasant boy. After the boy recovered from a mild illness caused by this inoculation, Jenner exposed him to smallpox and to his delight the boy did not develop the disease. He published his work in 1798 in three...

It all started with an observation. Edward Jenner, an English physician, observed that milkmaids who contracted cowpox were rarely victims of smallpox epidemic, a disease that in?icted a heavy toll on humankind with an estimate of 500 million victimsworldwide.In1796, Jennerinoculatedtheextracted?uidfromblistersonthe handofamilkmaidwhowasinfectedwithcowpoxintothearman8yearoldpeasant boy. After the boy recovered from a mild illness caused by this inoculation, Jenner exposed him to smallpox and to his delight the boy did not develop the disease. He published his work in 1798 in three...