Which of the following findings was essential for Edward Jenner’s vaccination process?

Flashcard maker : Ruth Blanco

A) A weakened microorganism will not cause disease. B) Exposure to a milder disease form may produce immunity. C) Someone who recovers from a disease will not acquire that disease again. D) Pathogenic microorganisms infect all humans and animals in the same manner. E) Disease is caused by viruses.

Answer:

B

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