FDA Grants Fast Track Designation for Two $PFE, $BNTX 's Investigational mRNA-based Vaccine Candidates Vs SARS-CoV-2     #Pfizer      #BioNTech     #SARSCoV2      #Coronavirus    #COVID19    #mRNA       https://t.co/ySWCFDauEu https://t.co/aiEbCKiyhp