of an on-going CDC study of HC front line workers who have been fully vaccinated (sound similar?)...they get 'swabbed' every work day and fill out regular questionnaires as to their health, comings and goings, etc. to see if the 'real world' effectiveness of the vaccines is "as advertised" and whether or not they can still be "spreaders"...again, the Pfizer and Moderna vaccines are judged to be 95% effective...but not 100%...also, just because those vaccinated folks don't get sick, doesn't mean COVID-19 "virions" (particles) haven't been inhaled and replicated to some degree, thus making them potential spreaders...This study will continue for 2-3 more years, btw, since "Enquiring Minds Want to Know" this stuff...especially given the nature of viruses and their variants.
Notice to all: I'm relaying just a bit of what I heard a month or more ago and have not discussed it since...don't plan to either...so, if you've got problems with this rendition, lay it on me, but that's all I've got...feel free to share your data, though.