China is inoculating tens of thousands of its citizens with experimental coronavirus vaccines and attracting international interest in their development, despite expert concerns over the safety of drugs that have not completed standard testing.

According to Reuters, Beijing has not released official data on the uptake in domestic targeted groups, which include medical, transport and food market workers.

But China National Biotec Group (CNBG), the Sinopharm unit developing two of the emergency use vaccines, and Sinovac have confirmed that at least tens of thousands of people have been inoculated. Additionally, CNBG said it had given hundreds of thousands of doses; one of its vaccines requires an individual receive two or three shots to be inoculated.