When Will the Vaccines Get Full Approval?

In this week's edition of the Covid Q&A, we look at why it’s taking so long for the Food and Drug Administration to approve the mRNA vaccines from Pfizer and Moderna, which are being used under an emergency authorization. In hopes of making this very confusing time just a little less so, each week Bloomberg Prognosis is picking one question sent in by readers and putting it to experts in the field. This week's question comes to us from Dave in Ashland, Oregon. He asks:

Why hasn’t the FDA taken the mRNA vaccines out of emergency-use status? My brother is waiting for full approval, and I worry about him.