The teenager, identified as Wu, was hospitalized on January 8 and is still in serious condition. Local health officials say the boy had contact with infected poultry.
"The people who had close contact with the patient are under medical observation," the news agency said. None of them has developed bird flu symptoms so far.
China has reported its first bird flu death this year occurred on January 5, when a 19-year-old woman from Beijing was diagnosed with the deadly virus and died in hospital. Last Saturday, a 27-year-old woman also died from bird flu.
Doctors are currently working to save the life of a 2-year-old girl, also infected with the deadly H5N1 strain. The source of her infection is being investigated.
According to the World Health Organization, of the 34 cases confirmed to date in China, 22 have been fatal.
