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

Question

Quizplus · Accepted Answer

Jenner's vaccination process relied on the observation that exposure to a milder form of the smallpox virus, cowpox, provided immunity to smallpox. Therefore, option D, "Exposure to a milder disease form may produce immunity," was essential for Jenner's vaccination process.

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