.@Merck CEO Ken Frazier speaking @HarvardHBS: To say that vaccine will be ready by end of 2020 is a disservice to the #public.  We cannot have a #vaccine ready without rigorous testing. $MRK #COVID19 #coronavirus #health #safety #drugs $JNJ $AZN $PFE $GSK $MRNA $NVAX @HBSAlumni