https://www.cdc.gov/mmwr/volumes/70/wr/mm7032e1.htm
Quote:
These findings suggest that among persons with previous SARS-CoV-2 infection, full vaccination provides additional protection against reinfection. Among previously infected Kentucky residents, those who were not vaccinated were more than twice as likely to be reinfected compared with those with full vaccination. All eligible persons should be offered vaccination, including those with previous SARS-CoV-2 infection, to reduce their risk for future infection.
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The best immunity is fully vaccinated + getting covid
Just getting covid while unvaccinated does not offer long term protection and you are at risk of reinfection.