I hate to share this, and Rob can delete it if it is not allowed, but we had to cancel our trip to Negril because of presumably false positive PCR test. The tests are supposed to be pretty reliable, but are not perfect. Just to briefly touch on what happened... I was tested only for travel (no symptoms, never any symptoms)...
Me: Negative Antigen (1/18), Positive PCR (1/18), Negative PCR (1/20)
Wife: Negative PCR (1/18)
Daughter: Negative Antigen (1/22)
I'm sure everybody says they are careful, but I have close contact with just a couple of other people, other than my household (wife and young daughter). Never been around anyone that has been sick (that I am aware of). The Department of Health told me to assume it was a false positive and to disregard it.