I’d hold off on the herd immunity planning. The Johns Hopkins assessment was interesting...until the Wall Street journal ran with it. The term “ulterior motives” was invented for the WSJ.
Now that may be true...but the current prediction of vaccine availability and distribution difficulties doesn’t point to April. July seems like a better benchmark.
I think it’s all but assured kids will be recommended too...adding another 60 mill to the pile.
July seems to be a realistic benchmark for when we get to a level of 70%-ish vaccination.
But even then, herd immunity isn't a switch. The way we get to herd immunity is that with most people vaccinated, the virus can find fewer and fewer people to infect. So with each reproductive cycle... fewer and fewer infections. Until it's all but gone.
If you instantly vaccinated 85% of the population today with JNJ, and it took instant effect... it would still be a few weeks to months before you reached herd immunity.