Developing:

Bird flu 101: How bad is the new H7N9 strain?

Associated Press
Bird flu 101: How bad is the new H7N9 strain?

A worker arranges containers of chickens at a wholesale market on Thursday, April 4, 2013, in Shanghai, China. In a worrisome sign, a bird flu in China appears to have mutated so that it can spread to other animals, raising the potential for a bigger threat to people, scientists said Wednesday. (AP Photo)

View Comments (0)