I have asked a couple times here on FR, and also tried to do some web searching, as to (vaccination aside) what flu strains common this year seem to be worst, and how symptoms might vary from strain to strain. This information seems to be harder to get than the truth of what is going on at the FBI!
I sure got whacked over the holidays, and was slow to recover...
Two Strains are out there....H3N2 and H1N1....
The H3N2 is the dangerous one....