according to Time. Basically, the pandemic came to a halt when the virus had infected enough people around the world to where it became harder for the virus to find new hosts.
Of course, by then, the Spanish flu did unspeakable damage, infecting 500 million people and killing 50 million. (Can we agree that nobody wants to see a repeat of those numbers?)Unlike the COVID-19 pandemic, there was no race for a vaccine among companies around the world.