The Deadliest Flu Season in History?
Season 5 Episode 40 | 7m 41s
The flu might feel like some minor illness that you don’t need to worry about much, but tens of thousands of people still die from it every year. And back in 1918, Flu killed up to 5% of the world’s population. Could a flu that bad happen again?
Aired: 10/31/18Video has closed captioning.