13 sailors from USS Theodore Roosevelt test positive after recovering

[lapfog_1]

1. antigen test sensitivity

meaning that it is possible that the negative tests were false negatives.

The virus was never completely gone.

And that is troubling... because what it means is that the antibodies made (by our immune system) are not "perfect" at killing the virus completely (if the assumption of false negatives is true).

The other possibility is that this is a second (or third...) infection, meaning that the immune response (the antibodies produced to fight the first infection) are either short-lived or possibly ineffective against the second infection due to mutation or other reason.

Either way, this is good news.