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Edward Jenner observed that people who had contracted cowpox, a mild disease, seemed to be immune to smallpox. This observation led him to develop the smallpox vaccine.
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Edward Jenner observed that people who had contracted cowpox, a mild disease, seemed to be immune to smallpox. This observation led him to develop the smallpox vaccine.
The correct option is:
- The protective effect of cowpox.
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