Beijing has reported its first confirmed case of the latest strain of bird flu, which until now has only been reported in eastern China.
Health authorities say a 7-year-old girl has been confirmed to have the H7N9 virus and is being treated in a Beijing hospital.
Eleven people have died in eastern China since the virus was reported in humans for the first time last month. The virus is believed to have been transmitted from birds to humans, triggering massive culls at poultry farms and restrictions on poultry trade.
Experts worry that this new strain of bird flu could become easily transmissible and trigger a pandemic, although the World Health Organization says so far there is no evidence of the virus spreading from human to human.