Every claim thus far that such and such a population has “reached herd immunity” is incorrect. That’s why we keep seeing surge after surge. What is true is that partial population immunity changes the threshold at which behavioral change produces a plummet in cases ....
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An odd political side effect of Trumpian “herd immunity” boosterism was some degree of denialism that immune effects contributed in any way to plunges in cases —the ironic thing is that admitting the latter has little policy implications. Either way we want to squash & vaccinate.
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Also half immune and half not is the perfect system for evolving variants that best the vaccine-induced defenses
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The term herd immunity seems to have different meanings in different contexts & based on different people’s understanding. If you assume it implies a virus will be eliminated from a population (like measles) then HI will likely never be reached for COVID.
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COVID is is expected to become endemic causing infections every flu season like endemic CoV. At some point due to immunity, the numbers infected will be lower as will the burden of morbidity/mortality bc even though reinfections can occur they are typically mild/asymptomatic.
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Absolutely - and the originators of the concept wouldn’t recognise this binary categorisationhttps://twitter.com/mendel_random/status/1326530787961954304 …
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