The head of the Chinese Centre for Disease Control and Prevention says he has been injected with an experimental coronavirus vaccine in an attempt to persuade the public to follow suit when one is approved, AP reports.

“I’m going to reveal something undercover: I am injected with one of the vaccines,” Gao Fu said in a webinar hosted by Alibaba Health, an arm of the Chinese e-commerce giant, and Cell Press, an American publisher of scientific journals. “I hope it will work.”

Gao did not say when or how he took the vaccine candidate, leaving it unclear whether he was injected as part of a government-approved human trial. He did not respond to requests for comment.