Experts say it will take at least 12 to 18 months to develop an effective vaccine, possibly even longer. China has a fifth potential coronavirus vaccine in a human trial and more are on the way, a health official said Friday, as the world races to find a formula to stop the contagion in its tracks.
So far there have been no "major adverse reactions" reported among the 2,575 volunteers participating in the five phase-two tests, said Zeng Yixin, deputy director of the National Health Commission. "According to the plan, if all goes well, the above projects will complete the second phase of clinical trials in July this year," Zeng said.