Question

which disease causing microbes are weakened and used as vaccine against small pox by jenner​

Answer 1

Answer:

The first vaccine was introduced by British physician Edward Jenner, who in 1796 used the cowpox virus (vaccinia) to confer protection against smallpox, a related virus, in humans.

Explanation:

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Answer 2

Answer:

The first vaccine was introduced by British physician Edward Jenner, who in 1796 used the cowpox virus to confer protection against smallpox.

Explanation:

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