The calculation of percentage of the population needing to have some form of immunity to achieve herd immunity is
(1 - 1/Rzero)
If current numbers are correct and Rzero is 2.4 to 2.8 for WuVid, then 58 to 64% gets it done
The highest estimate I ever saw for WuVid was 4.8, so taking that as a worst case 79% gets it done. Why should everyone have to get vaccinated for this?
One factor that damps the enthusiasm for the flu shot is its self-admitted low effectivity. I think you're doing pretty good when ~45% of the people still get a shot when it is 30% effective against the illness
There was a preliminary study released recently out of UCSF that concluded 50 to 80% of people would be covid positive and asymptomatic
That along with studies out of IU, New york, and LA, herd immunity is very attainable. This is assuming those recovered retain antibodies, though as of now it appears the body has a short memory for Covid (as it does for the flu).
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