My concern is that, for some reason, some policy makers are screwing around with Vax schedules. If we follow schedules that do not conform to the data-driven, prescribed schedules, there are no guarantees that we will vaccinate enough people to achieve herd-immunity.
Right now, if I understand things correctly, test data associated with vaccine prescribed administration is probably the best known aspect of this pandemic, and following said administrations is probably the best way of beating or mitigating this thing, yet some governments are willing to compromise on this.