China has a fifth potential coronavirus vaccine going to be tested in humans 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.

The test will be done 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.

More vaccine candidates are in the pipeline and awaiting approval for human trials, he added.

China had previously said four human trials for possible vaccines were underway. Experts say it will take at least 12 to 18 months to develop an effective vaccine, possibly even longer.

Scientists around the world are working at breakneck speed to develop a vaccine for COVID-19, the disease caused by the virus, which has killed more than 300,000 people and infected over 4.4 million.