And, don't get me wrong, the bird flu killed off both groups.
That's why bird flu may be a better name for the threat.
More than half of the time, bird flu leads to death.
With bird flu, it is not if, but a matter of when.
Bird flu can make people very sick or even cause death.
The lab has been working on bird flu since the 1970s.
Health officials confirmed the first human case of bird flu in the country.
Bird flu has killed at least 20 more in Vietnam.
Like so much about bird flu, it's not entirely clear.
This bird flu has infected about 120 people and killed 60.
