Global disease experts say little is known about China's experience with long-term COVID effects thought to have afflicted millions with debilitating fatigue, brain fog and other symptoms
There are currently about 10 coronavirus vaccines being tested in humans and experts have predicted that a safe and effective vaccine could take 12 to 18 months from the start of development.
Earlier this month, Moderna had released data that showed the vaccine, mRNA-1273, was safe and produced protective antibodies in a small group of healthy volunteers.
The drug developer also reiterated its plans to begin late-stage trials in July.