Spanish Flu More Condition_symptoms What Would Happen If The Swine Flu Came Back In The Fall Much More Grave Than It Is Now?

What would happen if the Swine Flu came back in the Fall much more grave than it is now? - spanish flu more condition_symptoms

You know, like the famous flu pandemic of 1918,
began to grow soft as normal influenza, has opted for a
Bits, then a few months later, was still persistent
causing more deaths. O_O