Researchers in the United States have conducted a study showing the difference in antibody evolution following vaccination against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) between people who have not previously been infected with the virus and those who have.
— Read on www.news-medical.net/news/20210801/Antibody-responses-following-SARS-CoV-2-infection-more-potent-than-vaccine-elicited-ones.aspx

Quite obviously, I should add.