It is interesting, in that the younger and healthier you were, the faster you died.
The mechanism was an overcharged autoimmune response to the virus, which filled the lungs with fluid.
So if you were old, or otherwise had a compromised immune system, you sneezed twice and felt no other effects.
This virus actually ended WWI, BTW. Nobody could field healthy troops anymore. Not even the US - a shp would leave for Europe, and half of the soldiers would die of the flu before it got there.
Hmm. Why haven’t the Spanish flu happened since then? I mean this is much more connected world than it was back in 1918 when air travel wasn’t even possible.