avian
How Big a Threat Is Bird Flu?
Cows and at least one person in the U.S. have been sickened by avian influenza. We asked experts about the risk to humans. Learn more about your ad choices. Vis…
How Bird Flu Went from an Isolated Avian Illness to a Human Pandemic Threat (Part 1)
Bird flu outbreaks in poultry and cattle have caused concern for public health officials. There have been few reported cases of human transmission, but the grow…






