Rise in Bird Flu Infections Show Risks of Fast-Changing Variants voanews.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from voanews.com Daily Mail and Mail on Sunday newspapers.
A jump in the number of people in China infected with bird flu this year is raising concern among experts, who say a previously circulating strain appears to have changed and may be more infectious to people