“Apparently the Red Cross said 20% of blood donations from unvaccinated people showed covid antibodies. If we presume that is a good sample size of the population at large we can extrapolate that 20% of unvaccinated people have a natural immunity.”
******************************************************
But there will be a good bit of overlap between the two groups. There is no restrictions on donating blood if you have received American authorized COVID-19 vaccination.
True. But they specifically called out “unvaccinated donors” in their report so I presume it is fairly accurate, if self-reporting.
If true, and if it is representative of the country, the infection rate was much higher than reported. I presume a lot of asymptomatic or minimally symptomatic cases.