"The first ever vaccine was created when Edward Jenner, an English physician and scientist, successfully injected small amounts of a cowpox virus into a young boy to protect him from the related (and deadly) smallpox virus.
The real story is more interesting. Jenner was a quack that allegedly purchased his medical degree. See
Smallpox Vaccine: Origins of Vaccine Madness.
There is no correspondence between cowpox and smallpox as legitimate scientists of Jenner’s day were well aware. Nevertheless, based on the superstition of dairymaids, on May 14, 1796, Jenner conducted the famous experiment that is the foundation of the practice of vaccination. If a rational person wanted to test the theory that a previous dose of cowpox prevented smallpox, he would surely have conducted a survey. But Jenner proceeded to experiment on an eight-year old boy, James Phipps by inserting cowpox pus from a dairymaid, Sarah Nelmes, into incisions in his arm.
Two months later, on July 1st, 1796, Jenner made more incisions into the arms of James Phipps but this time he smeared the cuts with smallpox pus. The boy did not contract smallpox. As no figures were kept in this era it is impossible to say whether insertion of smallpox pus under the skin inevitably produced a case of smallpox. Many people, including children, were immune to smallpox anyway having encountered it without developing a case of the disease. Furthermore, Two months later, on July 1st, 1796, Jenner made more incisions into the arms of James Phipps but this time he smeared the cuts with smallpox pus. The boy did not contract smallpox.
Creighton tells us that James Phipps, even if her were “perfectly well on the ninth day” as Jenner wrote, had ulcers on his arms which took weeks to heal. Some writers claim that James Phipps died from tuberculosis at the age of twenty-one but one source states that he recovered and lived until 1853.15 Jenner’s son, who was also vaccinated more than once, died at twenty-one from tuberculosis. Tuberculosis is a condition that some researchers have linked to the smallpox vaccine.16 In fact, Dr. A. Wilder, Professor of Pathology and former editor of The New York Medical Times, went so far as to say, “Consumption (TB) follows in the wake of vaccination as surely as effect follows cause.” 17