The US Food and Drug Administration expanded the emergency use authorization for Pfizer’s Covid-19 vaccine to include people ages 12 to 15. CNN’s Sanjay Gupta looks at how the clinical trials unfolded.
The US Food and Drug Administration expanded the emergency use authorization for Pfizer’s Covid-19 vaccine to include people ages 12 to 15. CNN’s Sanjay Gupta looks at how the clinical trials unfolded.
