Is Krauthammer a scientist? Or a theologian? Or both?
From reading his columns over time I've gleaned that he's most likely a religious man (Jewish), although I'd hesitate to call him a "theologian."
The bird flu virus is not evolving.
It's mutating. It's a virus that has been around for a long time and is changing slightly.
There are plenty of examples of mutation in biology which ARE observable.
Evolution is a separate matter. It is a theory.
Despite Darwin's title "Origin of the Species", no new species has been shown to originate from another.