Shop Print Media, No drawers, 92% Polyester / 8% Spandex, Submucosal Lifting Agent, 15-3/4 Inch Length, 3.5 Gram, For use as an Unassayed Reactive Quality Control with in vitro Assay Procedures for Determination of SARS-CoV-2 Total IgG / IgM and SARS-CoV-2 IgG in Human Serum or Plasma