Achieved serum samples of the different testing groups are retrieved and tested with the immunoassays according to manufacturer's instruction.~The test results are then compared and analyzed with statistical tests to assess the immunoassays'performance
Achieved serum samples of persons with or without evidence of COVID-19 infection are tested using the different commercial SARS-CoV-2 antibody immunoassays. The performance of the immunoassays is then assessed by comparing the 2 groups of samples.