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How we conquered the deadly smallpox virus - Simona Zompi

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For 10,000 years, humanity suffered from the scourge of smallpox. The virus killed almost a third of its victims within two weeks and left survivors horribly scarred. But Simona Zompi commends the brave souls – a Buddhist nun, a boy, a cow, a dairymaid and physician Edward Jenner – who first stopped the spread of this disastrous disease, to make us smallpox-free today.

Why does a previous infection with the cowpox virus protect humans against smallpox virus infection and disease?

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