4 ms·
How do they know for sure people have not been exposed? I don’t see how you could prove definitively that a person wasn’t. And with many cases being asymptomati
by mberning 6y ago
How do they know for sure people have not been exposed? I don’t see how you could prove definitively that a person wasn’t. And with many cases being asymptomatic they could have had it long ago and not known.
- mbrubeck 6y agoThe 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.
- j4kp07 6y ago"All of the donors were recruited between 2015-2018, excluding any possibility of exposure to SARS-CoV-2."