Discussion
The vaccine for smallpox was discovered by
Answer: C
The smallpox vaccine was discovered by Edward Jenner.
In 1796 the English physician Edward Jenner showed that inoculating material from cowpox sores protected a person against smallpox. The word vaccine comes from the Latin vacca, cow. Mass vaccination later led to the eradication of smallpox, declared in 1980.
Ronald Ross showed that mosquitoes transmit malaria, Robert Koch identified the bacteria causing tuberculosis and cholera, and Alexander Fleming discovered penicillin.
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