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Here is why I think my definition of herd immunity matters. So do I. That is what Taiwan has done. Taiwan has the delta-variant and has only about 25% of its population vaccinated. Its schools and economy are almost fully open. Yet its Covid infection rate is low and still declining. They have effectively achieved herd immunity even with a low vaccination rate by having a population that behaves in a way that reduces infectivity. No, they have achieve low transmission by behavior . That is a different thing than “herd immunity.”Definition: 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. "the level of vaccination needed to achieve herd immunity varies by disease but ranges from 83 to 94 percent"You can change the level of infectivity by behavior, but you cannnot change the level of herd immunity which remains the same because it is based on *natural reactions to pathogens*, not behaviors of individuals in a group.You can change the definition to suit yourself if you like, but you can’t change it for everyone else just because you think you should. Words - and a common understanding of them - matter.
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