Earlier quoted context omitted.
The flu regularly migrates between pigs, chickens and humans. Whenever it does, the poorly adapted flu is unusually lethal. The misnamed Spanish flu seems to have killed by triggering a strong immune response. That response is called a cytokine storm. Which means that the stronger your immune system, the more likely you were to be hit hard. It therefore killed the reverse of the groups that normally get killed by dis…
Primarily death was due to bacterial pneumonia, the cytokine storm likely accelerating the deterioration of the lungs. That particularly viral strain may have been more dangerous, but overall the current pandemic is comparable in death rates. It would seem during the Spanish flu your best chance of survival was being in a location where strict quarantine and travel restrictions were imposed so the health system was a…
"In 1918, doctors lacked intensive care units, respirators, antiviral agents, and antibiotics, an important fact in light of historical evidence of interactions between influenza and secondary bacterial respiratory pathogens (e.g., Haemophilus influenzae) as a significant cause of death during the pandemic." https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2374803/