The Flu That Killed 50 Million

A terrifying virus. The world in panic. Scientists battling for a cure. Sounds like 2020 - but it's 1918. This one-off special brings to life the onslaught of the Spanish flu that would kill three times more people than the Great War that preceded it.

What lessons does this horrifying pandemic teach us? And could the deadly spread of coronavirus have been avoided if we had heeded them?