View Full Profile. Learn about our Editorial Policies. Thanks to a Cold War-era division of responsibility, smallpox has been held in just two places in the world since 1984: at the CDC labs in ...

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.

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 ...