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Originally Posted by dirk digler
Yep it seems to be random on who it affects which makes me think there is some immunity, genetics, blood types that offer some protection.
The only other thing I could think of is she wasn't wearing much PPE back in March and maybe got it early and the antibodies are now gone so the tests can't detect it. I don't know much about these antibody tests to say either way though.
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Antibody tests are super unreliable. Especially with false negatives. Also people with no or mild symptoms often don't develop detectable antibodies.