BEIJING, Feb. 21 (Xinhua) -- Chinese scientists are racing to develop vaccines against the novel coronavirus by adopting five technological approaches, a senior National Health Commission official said Friday.

"Some projects have entered the stage of animal testing," Zeng Yixin, deputy director of the commission, told a press conference on China's fight against the novel coronavirus outbreak.

"Under the premise of ensuring safety, effectiveness and accessibility (of vaccines), (we) foresee that as soon as from April to May this year some vaccines could enter clinical trials, or under specific conditions, could be applied for emergency use," he said.

"Our goal is that if required by the outbreak situation, the emergency use of vaccines, as well as the emergency review and approval process, can be activated in accordance with laws," the official said.