Mendel
Senior Member.
More on this not-quite-current event:

This message featuring a Red Cross nurse and prevention instructions appeared in the U.S. publication Illustrated Current News in 1918.
Source: The National Library of Medicine. Images from the History of Medicine Collection
There was no vaccine at all at the time.
Influenza is different from Covid in that there are some very different strains around, and depending on which generation got exposed to what, you can have some cross-immunity in parts of the population. So it's possible (though I'd need to read up on that) that stopping the Spanish Flu took advantage of some existing immunity; but we don't seem to have that with Covid.
Covid spreads more easily than flu, and emergent strains get better at spreading (omicron is expected to spread faster than delta):
R0 for the Spanish flu way around 2 in cities, and probably less in rural areas that weren't as well connected as modern life is now. It required less of the population to be immune to stop spreading.
Also, influenza has a very strong seasonality, meaning it spread very little in summer, which helped to get rid of it.
This message featuring a Red Cross nurse and prevention instructions appeared in the U.S. publication Illustrated Current News in 1918.
Source: The National Library of Medicine. Images from the History of Medicine Collection
There was no vaccine at all at the time.
Influenza is different from Covid in that there are some very different strains around, and depending on which generation got exposed to what, you can have some cross-immunity in parts of the population. So it's possible (though I'd need to read up on that) that stopping the Spanish Flu took advantage of some existing immunity; but we don't seem to have that with Covid.
Covid spreads more easily than flu, and emergent strains get better at spreading (omicron is expected to spread faster than delta):
Article: The Delta variant is now replacing all other SARS-CoV-2 variants. We found a mean R0 of 5.08, which is much higher than the R0 of the ancestral strain of 2.79. Rapidly ramping up vaccine coverage rates while enhancing public health and social measures is now even more urgent and important.
R0 for the Spanish flu way around 2 in cities, and probably less in rural areas that weren't as well connected as modern life is now. It required less of the population to be immune to stop spreading.
Also, influenza has a very strong seasonality, meaning it spread very little in summer, which helped to get rid of it.
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