Did they use the rapid antigen test on arrival? The departure tests are molecular PCR which are much more accurate, and the rapid antigen tests have a false positive rate that isn’t great. It may well be that the person doesn’t actually carry the virus. Quarantine is a good idea regardless, but Tonga may still be okay. While breakthrough cases obviously do happen, someone who is double-vaxxed and tests negative on PCR is pretty vanishingly unlikely to be infected.
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