Covid toes" or innate resistance to SARS-CoV-2

Have you had purplish blue toe(s) during the Covid peak dʹepidemic, without having symptoms or even testing positive for coronavirus? You may be naturally resistant to SARS-CoV-2. Dermatologists at the Centre Hospitalier Universitaire Vaudois are setting up a cohort of patients to study this unusual immune response biologically and genetically.