This is a prospective, four groups, open, comparative, controlled study. A total of 400 completed, evaluated subjects will be enrolled in this study. Main Study Measures: Reactivity of T cells to selected SARS COV-2 peptides by MA test and IgG Antibody response to SARS COV-2 by commercial ELISA test.~Study Procedures:~Screening~Informed consent signing~Medical history review~Blood collection.~MA test and ELISA test will be performed at Savicell's Laboratory site.
The analysis method described in this protocol is a novel simple plausible immunological approach which is non-invasive, high throughput, real-time quantitative monitoring of metabolic activity (MA) profiles of fresh Peripheral Blood Mononuclear Cells (PBMC) in response to various reagents at different concentrations. The purpose of this study is to evaluate the T cells reactivity to SARS COV 2 immunogenic selected peptides by Metabolic Activity Method in convalesce and healthy individuals and to compare it with Antibody response (ELISA) and clinical information