At Answers in Genesis, there is an interesting article that covers the whole idea of the "evolving" bird flu epidemic.
"So is bird flu evolving? In a sense, this is a semantic trap. If ‘evolution’ is defined to mean ‘change’ or ‘genetic change within a population’, the answer is a clearcut ‘yes’. But most people hear the word ‘evolution’ and think that it means the fullblown story—molecules to mathematicians, and so on. And it simply does not follow logically that demonstrating that organisms can change shows that they are capable of the sort of change required to turn microbes to microbiologists."
You can read this article further at AIG.