“It killed 50 million people worldwide, or about a third of the world’s population.”
LOL, you might want to check that stat. The world’s population was a bit more than 50 million in 1918 and the mortality rate for the Spanish Flu was not 33%.
The 1918 influenza pandemic was the most severe pandemic in recent history. It was caused by an H1N1 virus with genes of avian origin. Although there is not universal consensus regarding where the virus originated, it spread worldwide during 1918-1919. In the United States, it was first identified in military personnel in spring 1918. It is estimated that about 500 million people or one-third of the world’s population became infected with this virus. The number of deaths was estimated to be at least 50 million worldwide with about 675,000 occurring in the United States.