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Russian flu, Spanish flu, pre-vaccine measles, pre-vaccine rubella, etc
Yes John, the 1918 flu was a lot worse than COVID19, and with a much more difficult age distribution, but the collateral public health damage is worse this time.
Spanish flu represents a significant part of the genetics of current circulating influenza Viruses which are controlled by vaccines
And the influenza vaccines started to be used in a large scale when?
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