Rapid at-home Covid tests are about to become much more widely available, the F.D.A. says.

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11. One of my sisters

went through that ordeal last week. Positive rapid test followed by a negative PCR, where they concluded that meant "inconclusive" so she got a 2nd PCR that was also negative. Her daughter had been out sick for a few days and tested negative for the rapid test but went on and got a PCR to be sure and tested negative. So that is when my sis and BIL got tested around that same time just in case (where BIL was negative for the rapid test but sis was positive for the rapid test - and since she has RA and is immuno-compromised, there was an obvious concern). They were fully vaccinated this past spring and my niece was too, as soon as her age group was eligible over the summer.

The one issue with Delta however is that it infects rapidly, reproduces large quantities of itself in a shorter period of time compared to past variants, but then "disappears" rapidly too, again when compared to previous variants. So I think in some cases, depending on the timing of the rapid test before someone eventually gets the PCR, any possible infection may have already dropped below the threshold for a PCR to capture.