Chinese health authorities have confirmed the first case of local transmission of the A/H1N1 flu virus on the mainland.The female patient showed symptoms on Wednesday morning. She was sent to hospital on Thursday and tested positive to the virus.

Both patients are now in a stable condition.

Medical experts said there is no need for the public to panic even after the case of domestic infection was discovered, because China has made careful preparations and the disease is largely preventable and treatable.

Li Xingwang, Director of Inspection disease Sector, Beijng Ditan Hospital, said, "The discovery of a domestic infection doesn't mean a growing risk of infection for the public. The disease is still under control, since people who have had close contact with the domestic case can be traced and quarantined for medical observation in time."