BEIJING--The World Health Organization gave China its support and understanding to start administering experimental coronavirus vaccines to people while clinical trials were still underway, a Chinese health official said on Friday.

China launched its emergency program in July, having communicated with the WHO in late June, according to Zheng Zhongwei, a National Health Commission official.

Hundreds of thousands essential workers and other limited groups of people considered at high risk of infection have been given the vaccine, even though its efficacy and safety had not been fully established as Phase 3 clinical trials were incomplete.

“At end-June, China’s State Council approved a plan of COVID-19 vaccine emergency use program,” Zheng told a news conference.

“After the approval, on June 29, we made a communication with the relevant representatives of the WHO Office in China, and obtained support and understanding from WHO,” Zheng said.

WHO’s representative in China did not immediately respond to a request for comment.

WHO chief scientist Soumya Swaminathan said in Geneva this month that national regulatory authorities could approve use of medical products within their own jurisdictions in the current emergency situation, but described that as a “temporary solution.”

The long-term solution lay in completion of Phase 3 trials, the WHO official said.

Beijing has not publicly released full details of its emergency use program.

At least three vaccination candidates, including two developed by state-backed China National Biotec Group (CNBG) and one from Sinovac Biotech, all in Phase 3 trials overseas, are included in the emergency use program.

A fourth experimental vaccine developed by CanSino Biologics were approved to be used in the Chinese military in June.