Applying this to say Spanish Flu, in Australia during that pandemic. About 40% of the population was said to…

Applying this to say Spanish Flu, in Australia during that pandemic. About 40% of the population was said to be infected. The herd immunity threshold for that pandemic influenza was around 74%? So nowhere near sufficient to halt the virus? But it stopped. https://t.co/cfKGpYNhNI

@CrabbBrendan I believe why the Spanish Flu ended is still contested? The rapid and almost simultaneous waves globally weren’t easily explained by antigenic drift and immunity?

This was an interesting read: https://t.co/4gEXDxyoxD