Most of the human deaths were in people who dealt with the infected birds, and most of the infected birds were in high-density groups, like factory farms.

The flyway thing doesn't seem to be "flying". The scientists expected the bird flu to migrate along the flyways, and it really hasn't. There have been some wild birds found with it, but not all that many, considering. Also, I read where there hadn't been a single case of this particular type of flu found in any domestic, true free-ranged flock (as opposed to pseudo-free-range high-density situations), even when they were near infected flocks.

They are also suspecting that many people have gotten mild cases of this flu, but they are only testing the serious ones and the dead victims for it, which would tend to throw the calculations way off.

Prepare, but don't panic.

Sue