Their vaccination porduction is tied to existing strains because that is what they can produce. Public health officials anticipate mutation and worry that vaccines for last years strains will be ineffective against what appears this year. They do the best they can. Unfortunately anticipating that something will mutate is different than being able to develop a vaccine to protect against what the virus will mutate into.
Exactly. So evolution's not producing anything except worry.
And even if Corkoman was right, which I seriously doubt, that the CDC anticipates specific mutations and proactively prepares for them. Knowledge of mutations is not the same as evolution. We believe we've seen strains of the flu leap from animals to man (i.e. Swine Flu). But that's not evolution either. It might be micro evolution but it's not anything on the scale of Darwinian macro evolution.
And even should the bird flu make the leap, it's still flu, it may mutate, but it hasn't evolved into anything other than the flu.