In reply to: A wild card is the immunity of those who have been infected posted by ufl
But that’s all the data they have. The vaccinations only began six months ago.
provide fairly long lived protection but it is expected to decline with time. Hence, the talk of boosters (although new variants are also involved with that).
Part of COVID's strategy is to suppress the immune system while it replicates. Some of the variants seem to reinfection a lot with natural immunity (P.1 is the big offender for this)