As it turns out, it is a different strain than originally assumed.
This strain (H3N2) was never detected in North America until before and it seems to have originated in Asia.
It is not yet known whether currently available vaccine provides any protection from this new virus.
That is a scary proposition. The virus being new here, our dogs' immune systems are not likely set to deal with it. And the vaccine either.
Source article:
Midwest Canine Influenza outbreak caused by new strain of virus
Further reading:
Chicago canine flu strain shocker
So....how did Asian H3N2 canine flu get here?