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?

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

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.