Efficacy studies of mRNA COVID vaccines range from about 50% to above 90%. I suppose this has been summarized somewhere. It may also be summarized reductions in disease severity, hospitalizations, and lowered risks of 'long COVID'. It is certain that some vaccinated people got COVID anyway. There is no easy way to know if one's disease was less severe. But look, you're not dead and not with long COVID. Might find some happiness in that. == Even after 3 Sinovac shots (traditional attenuated virus not mRNA). I know people here who got COVID, even got it twice. But they are not dead not long COVIDed either. I do not know them to regret vaccinations. I got 3 Sinovac shots any did not get COVID, So on the other side, but also true that I wore/wear mask in any perceived risky situations. Personal activities and experiences differ.
This summary probably belongs in the COVID discussion Safety & effectiveness of COVID-19 vaccines: A narrative review - PMC
For those birds, yes. For animal farming and general population ... less so I guess. Yer link: https://www.mass.gov/news/state-officials-suspect-hpai-outbreak-impacting-geese-and-other-wildlife