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Originally Posted by uke_master
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Nope this isn't what herd immunity means.
Yes it is. You are simply wrong on that.
Herd immunity is not a set thing. It is a loose concept and my loose description is absolutely part of it.
Expose population A to virus or predators purposely or not. Population generally loses (the cull) the weakest and most vulnerable amongst them until they get to a point where the predator or virus has little or no impact on the remaining members due to them being the stronger, healthier and now mostly immune ones.. The herd thn becomes stronger (more immune) against the predator/virus going forward.
it is not an absolute thing. It does not mean the virus/predator can never take anyone else nor that there won't be cycles but when they are generally talking about herd immunity in nature this is a big part of what they are talking about.