are believed to have been caused by over-reacting immune systems
I’m not sure what you mean by this. Most who died from the Spanish flu, actually had a literal allergic reaction to the Spanish flu? That people died from the medical treatment meant to combat the flu?
I’m not sure what you mean by this. Most who died from the Spanish flu, actually had a literal allergic reaction to the Spanish flu? That people died from the medical treatment meant to combat the flu?
I don’t believe it counts as an allergy, but it was their own immune system overreacting. It’s called a cytokine storm.