Are COVID-19 vaccines necessary for someone who has recovered from a COVID-19 infection ?

Yes !

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.

Reference:

Lancet. SARS-CoV-2 seropositivity and subsequent infection risk in healthy young adults: a prospective cohort study. DOI: https://doi.org/10.1016/S2213-2600(21)00158-2

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