For which of the following diseases first successful vaccination was devloped (it is caused by Variola virus)?

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Question:For which of the following diseases first successful vaccination was devloped (it is caused by Variola virus)?

1.Cow pox

2.Chicken pox

3.Small pox

4.Polio

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  1. For which of the following diseases first successful vaccination was devloped (it is caused by Variola virus)?
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