Since the advent of the pandemic. ABO blood group has a role in the immunopathogenesis of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection. Disagreement between forward and reverse typing leads to ABO discrepancy which arise either due to intrinsic problems or from the technical errors in performing the test. Here. https://www.roneverhart.com/Black-Sabbath-Purple-Logo-Metal-Pin/