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Symptoms of monkeypox can also be compared with smallpox — a related virus that was declared eradicated in 1980. Like smallpox, monkeypox causes pus-filled boils. But monkeypox is generally ...

Not so with smallpox. To create this vaccine, you begin with another virus that is similar to the smallpox virus, yet different enough not to bring on the smallpox disease once it enters your body.

They caused empires to fall and new ones to arise. Smallpox first emerged around 68,000 years ago. We have no idea how many people it has killed, but we do that in the 20th century alone it killed ...