A false positive is what the lady from Jost got when she arrived in SVG. Put all of Jost on lockdown. They redid the test and it turned out she was negative.

I suspect Cruzdoc is correct: tests before you go and when you arrive. What would really annoy me is having to pay for two weeks in some Tortola hotel. We are on 5+ acres on an out island - perfect place to quarantine. But I get the feeling the paid quarantine is as much about keeping some local hotels afloat as it is about quarantine.