Assay for measuring T cell immune response in connection with Covid-19 (SARS-CoV-2) for diagnostic purposes; diagnostic testing kits comprised of medical diagnostic reagents and assays for measuring T cell immunity and responses in connection with Covid-19 (SARS-CoV-2); Vaccine preparations for the treatment of COVID-19; Vaccines for the treatment of COVID-19; Human vaccine preparations for the purpose of treating COVID-19; Therapeutic vaccines for treating COVID-19; DNA vaccines for treating...