CDC estimates that one in three Americans have already been infected with COVID-19.
Red Cross: More blood donations showing COVID-19 antibodies
MSN
3/22/2021
https://www.msn.com/en-us/health/medical/red-cross-more-blood-donations-showing-covid-19-antibodies/ar-BB1ePRvp?ocid=uxbndlbing
“NASHVILLE, TN (WSMV) - Across the country, the American Red Cross is finding that about one in every five unvaccinated person donating blood has antibodies for COVID-19...
The Red Cross has tested more than 3.3 million donors is 44 states since June.”
Okay, the last quoted sentence might be a little misleading. The article pertained to the “latest numbers” from the Red Cross, “both from people unvaccinated and vaccinated.” I’ll try to find another source.
This might be helpful.
American Red Cross Releases a Set of Interactive Maps Depicting Results of COVID-19 Antibody Testing in Healthy Donors
https://www.redcrossblood.org/local-homepage/news/article/american-red-cross-releases-a-set-of-interactive-maps-depicting-.html
On second thought, what do results from blood donors tell us about how many people in the general population have antibodies? Maybe not much at all. Somewhere near 30% might be the best estimate that we have. I’ve seen estimates from doctors over the past month or so between about 20 and 30 percent.