Also, the "evolution" of this flu is not highly unusual, this ability to recombine with other strains has been known about for some time.
And, it is a virus, therefore I don't know what the heck you are talking about "previous medications can't cure"?
There are drugs like Tamiflu that can shorten the duration of illness, but Influenza has a rapid mutation rate, therefore drugs that are used widely in the population often become ineffective quickly.