Bird flu: How is North America's largest-ever outbreak spreading? - study
“There's reason to expect this virus is here to stay, and it's not going to disappear."
Chickens await vaccination against bird flu at the settlement Peredovoi 100 km (62 miles) from the Russia's southern city of Stavropol, March 11, 2006.(photo credit: EDUARD KORNIYENKO/REUTERS)ByTZVI JOFFREUpdated:
