kickingandscreaming
PREMIER
Excellent article. It gets beyond the basic example you show and then explains why some experts expect it to be less than 60% - some significantly so. Not sure which ones were already peer reviewed.Any discussion about mathematical equations related to herd immunity at this point in the pandemic is premature.
"Let’s say the R0 for COVID-19 is 2.5, meaning each infected person infects, on average, two and a half other people (a common estimate). In that case, the herd immunity threshold for COVID-19 is 0.6, or 60%. That means the virus will spread at an accelerating rate until, on average across different places, 60% of the population becomes immune."
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The Tricky Math of Herd Immunity for COVID-19
Herd immunity differs from place to place, and many factors influence how it’s calculated.www.quantamagazine.org
It addressed the idea that some people are more susceptible than others. However, I was disappointed they didn't address the "super spreader" idea that is out there and whether these folks are just at the wrong place at the wrong time (random) or if there is a strong correlation to behavior and being a super spreader. It is not much of a stretch to believe that a "super spreader" is also much more likely to get the virus as the behaviors to spread to others would match the behaviors to get the virus. If super spreaders exist and are more likely to catch the virus, that would definitely lead to a more significant early spike in cases and then a considerably lower "herd immunity" percentage than initially estimated as "super spreaders" catch the virus at a rate higher than the lower spreaders.