Maybe. Or maybe by being vaccinated they're raising their likelihood of becoming asymptomatic spreaders, as per the multiple fully-vaccinated cruise ship outbreaks (ibid). See
whooping cough for an example of asymptomatic spread despite near universal vaccination (and for the avoidance of any doubt, this is
not an anti-vaccine position, it's actually an argument for even earlier vaccination).
I'm really struggling to find any data for reduction in infections or transmission. Remember, all of the current vaccines
only claim to reduce death and severe illness in the recipient. None of them made any claim, or even attempted to collect evidence, regarding reduction of infection or transmission. As far as I can tell, we just assumed that, and it's become asserted as a tenet of faith.
The policy for care home staff is one
PCR test a week, lateral flows every two days or on a change of location. This is current advice, 23rd December 2021, with what should now be fully vaccinated staff.
This is a tacit acknowledgement that vaccination is not sufficient, as supported by the cruise ship examples. So why is it
necessary?
I know, precautionary principle, you can't be too careful, every little helps. Absent any evidence though, it seems more like ritual than science.
And there's the other curious thing: patrons are required to be vaccinated, but staff aren't.
Why have opposite policies for care homes and nightclubs? The few-to-many relationship applies in either case. It gives me a pain in all the logic diodes down my left side.
I'm minded of an anecdote that I saw on social media (100% guaranteed factually true, and anecdote is the singular of data, right?) about a technician working the club and theatre circuit claiming that staff physically recoil from him when he presents a recent negative test result rather than evidence of prior vaccination.
I'll leave parsing the rationality of that as an exercise for the reader.