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Both times symptoms, is why they got tested. Not very bad, in normal circumstances they would probably have come in to work feeling a bit under.
That is interesting. Assuming that the PCR tests were accurate, and they truly had two separate infections, three possibilities come to mind:
1 - it was a mutated strain, that was able to bypass immunity.
2 - they had the same strain twice, thus throwing everything we know about cold and flu infection and immunity after recovery into doubt, or requiring some major modifications.
3 - these people have some kind of immune system deficiency.
Options 1 and 2 apply equally to vaccines.
Option 2 can not ignore the unprecedented testing that has happened with COVID. No one gets a test for extremely mild symptoms. Is it possible that this is the case with all colds and flus? Can you catch them twice, with lesser symptoms the second time around because the immune system is primed? Just because a person’s immune system is ready does not prevent the virus from continually attempting to reinfect.
Option 3 would be specific to individuals.