Which of the following findings was essential for Edward Jenner's vaccination process?
A)Exposure to a milder disease form may produce immunity.
B)A weakened microorganism will not cause disease.
C)Someone who recovers from a disease will not acquire that disease again.
D)Disease is caused by viruses.
E)Pathogenic microorganisms infect all humans and animals in the same manner.

Question

Quizplus · Accepted Answer

Edward Jenner observed that milkmaids who had contracted cowpox, a milder disease similar to smallpox, did not get smallpox. He hypothesized that exposure to cowpox produced immunity to smallpox, which laid the foundation for his vaccination process.

Which of the Following Findings Was Essential for Edward Jenner's