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Originally Posted by uke_master
Correct. You have indeed identified one thing that it is not. Good job!
False. R_t<1 is not the same thing as spread no longer happening. Just like your previous claim "virus ceases to then circulate in the population" this is just not true. It's not true in the short term (the virus is still spreading) but it particularly not true in the medium or long terms where we have a dynamic situation with declining levels of immunity, increasing transmittivity etc. You are correct that R_t has temporarily fluctuated less than 1 multiple times in the pandemic and this explains why we have ups and downs, but this isn't the same thing as herd immunity that can be "approached" as you suggest.
Requoting these as you didn't repeat your most egregious error, which was to conflate herd immunity with something to do with level of harm to those who get it. Nope. Nope nope nope. Sorry, herd immunity has nothing to do with the severity of the illness for those who get it.
Nothing you seem to be saying here is a good summation of my position. No surprise there given your history.
Again the casual use of herd immunity, even in animals is not about no more cases or deaths. it is about a threshold by which the exposure is met (predator or virus) , those who are going to get caught do, those who get sick or die do, and the rest of the herd is the stronger members of the herd.
That does not mean the remaining herd cannot be hunted by other predators nor by other viruses, as they can be. But still the concept of herd immunity is discussed and we ALL KNOW what they mean.
Covid is exacting the same dynamic in human populace. Whether vax'd or not it is exposure, sickness or not, death or not, a healthier group left on the other side of exposure with some protections.
Again those protections do not have to be forever for the vax'd or unvax'd or prey animal. Another attack may come later and some running of the process may happen again but just with the prey animals discussing that process and the protections gained as herd immunity has been the norm of casual speech for ages.
My use of it here in this dynamic is neither incorrect nor out of the norm. It is what is going on with the unvax'd who are embracing getting the virus and rolling the dice with their outcome. They are embracing a herd immunity approach to this and saying 'let us catch it, and let us build our natural immunity and if some of die, so be it.'