If someone has recovered from a COVID-19 infection, they would have some protection against getting another COVID-19 infection.
But, even if someone has recovered very well from a previous infection, vaccination is necessary because there is still a significant risk of getting COVID-19 infection again.
A recent study published in the medical journal Lancet reports that people who had a previous infection have about one-fifth risk of getting an infection again compared to those without a previous infection.
So while there is some protection against future infections, there is still a risk and hence it is prudent get the Vaccine when it is offered.
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