and got well. Is there a way to know they had it ? I searched briefly and couldn't find a straight answer.
If it’s developed, you would be able to use a serological based test to determine if you have memory B cells in your blood, indicating a past exposure. They wouldn’t be able to tell you when it happened, just you were exposed to the virus and your body mounted an immune response.
For example, at some point prior to my current job, my blood work indicated I had Q Fever at some point or was at least exposed to the bacterium that causes Q Fever.
The odds of this being in humans 19 months ago is really low based on the data.
What about hitting here from November - February?
Yes, you'd want to have two different tests though to definitively rule out any previous infectious. One test that tests for the virus itself (normally referred to as PCR where the genome of the virus itself is detected) and one that tests for the antibodies to the virus. Usually IgM antibodies have a long enough life span to where they are detectable 2-4 months after an infection. But detecting IgM antibodies to CoV-19 is likely only being performed by the CDC and probably a handful of R&D labs as an investigational tool. Getting access to something like that would be a long shot.
Some officials are speculating that it was actually in the US before 2020 due to it actually being in China in November 2019 and no real travel restrictions.
IF that is accurate, it’s a good thing.
It means it’s either not as infectious as thought or not nearly as lethal as 3.8% as thought.
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