Talking to my wife last night, she reminded me that our daughter, who works at a resort in CO, was really sick back around Nov/ Dec. (I think late Nov.). Fever, sore throat, cough, etc...docs tested for strep, flu, pneumonia...everything. They sent her home with an "undetermined flu" or something similar. This "flu" swept through her resort in a week, two max.
Dec., a friend of ours who works at Disney had her family down from NYC. The aunt is an ER nurse. Several of them had an "undetermined" flu though not everyone in the family seemed to be affected despite being in close proximity.
As this shit rages through NYC our friend's aunt is fine, the ER nurse with the undetrmined flu back in Dec.
We will never know when this really started in the US and any numbers we see in the upcoming years will be guesses.
Similar situation here. Around Christmas / New Year just about every at the office plus their kids were sick with same symptoms. We actually went to fist-bumps instead of handshakes because of it. No telling if it was the beginning of this current strain or not.