Medical experts advise that people should get a vaccine for the bird flu when it becomes commercially available. One doctor said the most at-risk patients should be first.

H5N1 - has led to the first known casualty. While there is no known cure, the CDC does recommend methods to protect yourself.

We last spoke in April, after a dairy worker became infected with bird flu. At the time, you described your level of concern about bird flu as “medium.” How would you describe your level of worry now?

Americans have also not fared too well with the bird flu. At least 66 people, most of them dairy workers, have been infected. Last week, the Louisiana Health Department reported the country’s first human death from bird flu: that of a 65-year-old man who had exposure to a backyard flock.

A fourth case of bird flu is under investigation. State agriculture officials discovered it in Clayton County.