This is an interesting take away. “ Given the many mutations of SARS-CoV-2, it is extremely unlikely that a single vaccine that blocks the virus will be found. At the moment 11 different strains have been identified: the A2a genetic line which developed in Europe and the B1 genetic line which took root in North America are more contagious than the 0 strain originating in Wuhan. I therefore believe that, at the most, a multivalent vaccine can be found effective on 4-5 strains and thus able to cover 70-75% of the world’s population.” B will be very valuable.