RE: catch 22?28 Dec 2020 22:07
Fdh, great post. My understanding is that herd immunity requires 70 percent immunity. The last AZ vaccine stats stated a pooled effacacy of 70.4 percent (iirc, haven't checked that). On that basis, you would surely need an uptake of 85 ish percent for herd immunity resulting from vaccination.
The counter argument is that once you've vaccinated those at highest risk some normality can return regardless.
The counter argument to that however, is the vaccine will likely be less effacious in the at risk age groups and therefore you need that comprehensive roll out across the majority of the population.
In addition, as you have correctly said, the biggest elephant in the room is how long the vaccine will last.
All of the above said, I expect the gov and media to be ramping the t*ts out of the AZ vaccine if it's approved over the coming few days as expected, so hold on tight as it might be a bumpy ride again...