This transcript has been edited for clarity. For more episodes, download the Medscape app or subscribe to the podcast on Apple Podcasts, Spotify, or your preferred podcast provider. Steven R. Feldman, ...

It all started with an unremarkable trip to grandma’s house in 1970. But two days into the visit, something went terribly wrong. The 9-month-old grandson fell ill. First, a fever. Then, a nasty rash.

Oct. 19 -- Smallpox was one of the deadliest diseases ever to afflict the human race, until a worldwide effort succeeded in eradicating it from the planet 25 years ago. But the events of the past few ...