The Effects of Prior Exposure on Immune Response to COVID-19

To determine whether such interactions exist, the analysis needs to include a group not exposed to A as a comparator frequently missing from the literature. And it's it becomes almost impossible to do because pretty much everybody's been exposed to COVID-19 at this point either by infection or vaccination. If you could find those small pockets of people, yeah, did not get vaccinated who did not become infected with the wild type, but did get infected with Omar Khan, I'm sure they exist. But right, it's either no effect. Where's the sin? Blessings and sins. Right.