Have you ever wondered what that small scar on the upper left arm is? You might have seen it on some people, or you might even have it. Well, it is from being vaccinated from small pox. The vaccine was actually pretty common before the 1970’s,
What it did is use live Vaccinia virus so that it can trigger an immune response that would protect people against the Variola virus that was dangerous and that caused smallpox.
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