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Cow pox is a viral infection of the cattle, which is caused by the small pox like virus. This virus infection is mild in human and gives cross immunity against the smallpox infection in human. So the first vaccine against the small pox was prepared by Edward Jenner in 1798. This medical discovery has saved the millions of lives. He is the person who has saved more lives than anybody else. With the help of this vaccine you could irradicate the smallpox from the world for ever.

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11y ago

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