Bird flu vaccines set to undergo clinical trials

Two human cases of H7N9 virus have been reported in the capital this year

Four kinds of vaccine for the H7N9 strain of bird flu virus have been approved for clinical trials by China's top drug regulator, according to the Beijing Food and Drug Administration.

The administration will continue to provide assistance and guidance for clinical trials of the vaccines so they can enter the market as soon as possible, it said in a statement last week.