After getting COVID, people do get an immune response, but this varies from person to person and it depends on whether you had a mild or more severe infection. And we know from many studies now that if you’ve had a very mild or asymptomatic infection, then many people may have very low levels of antibodies that form. So this is why we still recommend that even if you’ve had a COVID infection, you should go ahead and take the vaccine when it’s available to you because the vaccine serves as a boost to the immune system. -Dr. Swaminathan, WHO, 2021
Watch & Read–Do I still need the vaccine if I have had COVID-19?