It's referenced as a diagnostic test: https://www.mayoclinic.org/tests-procedures/covid-19-diagnostic-test/about/pac-20488900 https://www.mayoclinic.org/tests-p

It's referenced as a diagnostic test: https://www.mayoclinic.org/tests-procedures/covid-19-diagnostic-test/about/pac-20488900 https://www.mayoclinic.org/tests-procedures/covid-19-diagnos... What leads you to believe it is not? As for false positives, a cluster like that seems unlikely give they had a less effective vaccine overall and in terms of protection from variants. If they are false positives, I'd bet on sample or protocol contamination, not a random clustering.