GoofGoof
Premium Member
Speaking of "back of the envelope" math, Trevor Bedford presented a possible US outcome for Delta in a Twitter thread a couple days ago.
TL;DR: Estimates 38% of the US population is vulnerable (unvaccinated, no previous infection). Given UK numbers, estimates 29% of that group will be infected. Resolving into 11% of the US population that will be infected or about 36 million people. But large margin of error / low confidence, given "back of envelope" math.
That’s one way to get to herd immunity….not the easy way, but a possible path. When the dust settles in the next month of so on vaccinations I expect we will be around 60% of the total population vaccinated (including nobody under 12). 10.5% of the population has tested positive but the total actually infected could be as high as 20% or more. If we assume roughly half the natural infections came in the unvaccinated group it’s probably safe to assume around 10% of the population is unvaccinated but naturally immune. So 60% immune with vaccines and 10% naturally immune but unvaccinated gets us around 70% immune. If we then add 11% more of the population to that number we likely get above 80% immune which may be good enough to reach herd immunity and end the pandemic here. It will certainly be enough once a portion of the 15% of the population who are under 12 get added into the vaccinated group. If we get to hundreds of thousands or millions of cases a day (as suggested) it will also light a fire under the unvaccinated group and boost the vaccine numbers. Again, not the easy way, but a path that may work.