Which among the following was the first vaccine ever to be developed?
1) Cholera
2) Smallpox
3) Rabies
4) Tetanus
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Which among the following was the first vaccine ever to be developed?
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Which among the following was the first vaccine ever to be developed?
1) Cholera
2) Smallpox
3) Rabies
4) Tetanus
2) Smallpox