https://www.webmd.com/lung/news/20220330/cdc-most-americans-have-covid-antibodies
About 95% of Americans ages 16 and older have coronavirus antibodies, according to CDC datafrom testing blood donor samples.
The percentage includes antibodies formed from both vaccinations and COVID-19 infections, with nearly 70% of people ages 16 and up having received at least one vaccine dose, the data shows.
The seroprevalence -- or evidence of antibodies in the blood -- differs slightly by age, at about 94% in ages 16-29, increasing to 96% in ages 65 and older.
That may be one reason why public health officials have said BA.2, the contagious Omicron subvariant, could lead to an uptick in cases in the U.S. but not a significant surge, according to CNBC.
