The secretary said Hong Kong government has informed the mainland's authorities and required mainland's inspection and quarantine agencies to investigate the source of the exported poultry that was found carrying the virus.

Monitoring of the mainland chicken farms will continue after the three weeks of suspension of live poultry trading, and live fowl export to Hong Kong would not be resumed unless both the mainland and Hong Kong agree on the investigation results, the secretary told a press conference, adding that it had been the first case of H7N9 bird flu confirmed in imported live poultry in Hong Kong since the epidemic broke out on the mainland last March.

According to Ko, Hong Kong's disease control departments are looking for the deliver of the infected poultry who needs to be taken into disease control center for medical examination and observation.

The disease control departments will also follow health conditions of poultry dealers in the market and staff working for Hong Kong's import inspection and quarantine station.

P.L. Ho, president of the Center of Infection under the University of Hong Kong, said the confirmation of the first case of H7N9 bird flu in Hong Kong is no surprise, since an increasing number of human cases has been found on the mainland.

The poultry in the market where the virus was found should be culled, said Ho, because Hong Kong is threatened by an increasing possibility of H7N9 bird flu epidemic.