I was also referring to that, but in addition there is ongoing debate among scientists that’s strictly in terms of the direct medical benefit of a third shot.
The confusing thing, and I think something that’s causing some cross-threading here (so to speak) is that there are two separate issues: (1) The medical benefit of a third shot in preventing serious infection; and (2) the global benefit of (at least) a first shot world-wide. I would think that the former falls within the purview of immunology and the latter in epidemiology (with some overlap in virology, vis-à-vis mutations).
That’s on the scientific side. I feel that there are also some serious moral issues involved with giving third shots in rich countries while the rest of the world waits for even one.
For the immunocompromised, sure, and probably the “elderly” (i.e, card-carrying 75+ Old Farts like me) with supposedly reduced immune system protection (which I’m not so sure is true, but that’s another matter). Absolutely I’ll get the frickin’ third shot if Dr. Fauci says it’ll be good for me. But should everyone else already fully vaccinated here in the US of A get one too? I’m not persuaded.