'The Big One' could be even worse than COVID-19. Here's what epidemiologist Michael Osterholm says we can learn from past pandemics.

'The Big One' could be even worse than COVID-19. Here's what epidemiologist Michael Osterholm says we can learn from past pandemics.

The new book "The Big One" describes lessons learned from past pandemics and how they might be applied to mitigate the dangers of future outbreaks.