definition of herd immunity: “resistance to the spread of an infectious disease within a population that is based on pre-existing immunity of a high proportion of individuals as a result of previous infection or vaccination.”
as stated, prior infection (sars is the prior covid infection) or vaccination.
Herd immunity is only reached when the threshold is met. If 80% herd immunity is required, 80% minimum have to have immunity; only 20% max can be unprotected. If 90%, only 10%. Increase the percent of unprotected and the percent herd immunity drops proportionately.
My thought is that we reached herd immunity months ago. Even before these shots were rolled out.
Unfortunately, the shots have caused spread of variants.
We should never have masked, locked down or tried to “shot” our way out a PlanDEMIc.