>https://web.archive.org/web/20170219235003/https://www.fda.gov/NewsEvents/Newsroom/PressAnnouncements/ucm376937.htm
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those vaccinated may be (prolly definitive) more vulnerable to reinfections vs. unvaccinated individuals, this runs along the same lines on what Dr. Judy Mikovitz has been speaking about.
to add: wearing a mask all day long breathing in ones' own respiration w/a history of, say, flu vaccinations run the risk of reinfecting themselves igniting a synergy with the very virus they were vaccinated for.