Spanish Flu More Condition_symptoms Do You Think That The H1N1 (swine Flu) Will Come Back More Lethal This Fall?

Do you think that the H1N1 (swine flu) will come back more lethal this fall? - spanish flu more condition_symptoms

I wonder why they always a mutation of the virus has infected many people in so many countries, which could mutate easily. If you remember the Spanish Flu, have 3 different varieties. The first was similar to the flu season, but the second and third were very deadly. I think we could commonalities between them. But I do not know what you mean?