From the Spanish Flu wiki page:
The global mortality rate from the 1918/1919 pandemic is not known, but an estimated 10% to 20% of those who were infected died. With about a third of the world population infected, this case-fatality ratio means 3% to 6% of the entire global population died.
Far worse is this, which I found in an article about the Spanish flu I was reading recently:
Regardless of origin, one of the factors that made the influenza so deadly is that it turned the body’s natural defenses against it, unleashing an effect ominously called a “cytokine storm.” The white blood cells that are supposed to protect the body from disease become over-stimulated, producing an excessive amount of cytokines (a class of proteins intended to signal immune and endocrine responses). The cascading cytokines in turn triggered an often fatal inflammatory response leading to pancreatitis, fluid in the lunges, hemorrhaging and organ failure.
As a result, the pandemic’s highest fatality rate occurred amongst relatively young adults aged twenty to forty with strong immune systems, while comparatively sparing the lives of the very old and young.
So basically, the better your immune system, the worse the flu hit you. This situation is nowhere close to the Spanish flu.This comment was edited on Feb 29, 2020, 21:44.
“Extinction is the rule. Survival is the exception.” -- Carl Sagan