4 ms·
The unexposed samples were from blood draws taken from 2015 to 2018.
by mbrubeck 6y ago
The unexposed samples were from blood draws taken from 2015 to 2018.
- mberning 6y agoRight. Blood from 3-4 years ago has antibodies. One interpretation could be that those people were never exposed but somehow have antibodies which needs investigation. Another interpretation could be that covid-19 is a particularly bad seasonal strain of a disease that has been around for a long time. We probably will never know. People are still studying SARS and MERS.