Edward Jenner’s Vaccination

The transcript describes an investigation into the belief that cowpox provides immunity against smallpox. Local farmers and milkmaids believed that having cowpox prevented smallpox. An experiment was conducted by inoculating an 8-year-old boy, James Phipps, with cowpox pus. Afterward, he was exposed to smallpox but did not contract the disease, suggesting cowpox could prevent smallpox.

What were the results of the experiment after inoculating James Phipps with smallpox?

What conclusions can be drawn from the repeated procedures of the experiment?