Bird flu: Chinese Premier urges vigilance
29 April 2013 Last updated at 02:30 BST
Chinese Premier Li Keqiang is urging vigilance against a new strain of bird flu that has so far killed 23 people.
Mr Li says efforts to tackle the virus have so far been effective.
A leading American virologist says there's no evidence the deadly H7-N9 bird flu has yet spread between humans, but he has warned that health authorities must be ready for the virus to mutate at any time.
Russell Trott reports.