Help me with the math here. A "normal" virus that infects every age group equally would require 60-70% herd/vaccination immunity to stop the spread. But what about a virus that is massively biased toward 20% of the population? If we vaccinate around 80% of that 20%, are we done?
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I don't agree (though I think covid is overhyped). You asked if vaccinating 80% of the vulnerable 20% would effectively stop the spread - it would, if the vulnerable only interacted with each other. But spread (+serious illness) still occurs if... (1/2)
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... people in the vaccinated population meet with people in the non-vaccinated population where the disease still circulates. A bit like animal infections providing a reservoir for TB, even where the human population is mostly vaccinated so that TB "should" die out.
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Spread means mutations which means eventually it starts killing younger people.
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Israel had a study if vaccinated the 10% older, it could cut deaths by 75%
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