In March, Beijing gave the green light to another clinical trial for a coronavirus vaccine candidate developed by the military-backed Academy of Military Medical Sciences and biotech firm CanSino Bio, shortly after US drug developer Moderna said it had begun human tests for their vaccine with the US National Institutes of Health. "We can confirm now that three particular vaccines are being tested in China, and the National Health Commission has said it will have to clear a number of conditions before they can enable mass production of the vaccines globally," said Clarke.