2hats and others, thought you might be interested: I admitted someone last night who was 7 days post vaccination who was community pcr positive. I don't think he had coronavirus and think it was false positive. I contacted the PHE virologist who said it is possible : the pcr target in the community testing is just for the spike protein so it is implausible but possible that this was being picked up (but why would it be detected in mucosal surfaces?), but our in-hospital pcr testing has multiple targets and if only the spike is positive then it gets reported as negative.
Interesting if our confirmatory test is negative - we'll be writing that one up and letting PHE know ASAP!
(well, I'll be a bit delayed as my girlfriend tested positive at 5am so I'm now isolating...)