Probably little evidence for Covid-19, but for SARS, studies in animals have found limited immunity after both infections and vaccination attempts. https://www.

Probably little evidence for Covid-19, but for SARS, studies in animals have found limited immunity after both infections and vaccination attempts. https://www.medscape.com/viewarticle/706717_1 https://www.medscape.com/viewarticle/706717_1