Boost?

If the road to the new world goes through booster shots, then the new world will be further away than it is now.  Right now, every booster shot in a first world arm is a shot that is not in a third world arm.  Africa's vaccination rate is three percent.  Over a billion Africans remain unvaccinated.  Every shot that goes somewhere other than into an un-fully-vaccinated arm will make the pandemic longer and more people will die.

It's like those awful moral choice games people play - the train full of people, the bridge, and your son, for instance.  My first impulse was to refuse the booster until Africa is 70% vaccinated, but that's beginning to feel a little hyperbolic.  What do you think?  Booster or not, and why?