A two-year-old girl has been confirmed to be infected with bird flu in north China's Shanxi Province, the second case in the country recently.
The Xinhua news agency says the girl was tested positive for the H5N1 strain of avian influenza and is in a critical condition.
China's Health Ministry had notified the World Health Organisation, authorities in Hong Kong and Macau, and some other countries.
China confirmed earlier this month a woman infected with bird flu had died in Beijing after buying nine ducks at a market in Hebei province.
The H5N1 remains largely a disease among birds but experts fear it could change into a form that is easily transmitted from person to person, and spark a pandemic that can kill millions of people worldwide.