.@Merck CEO Ken Frazier speak @HarvardHBS: Last 25 years, only 7 real #vaccines have been created.  $MRK was responsible for 4 of those. #COVID19 #coronavirus #health #safety #drugs $JNJ $AZN $PFE $GSK $MRNA $NVAX @HBSAlumni #business #money #StockMarket #Stock #investment