This kit is intended for the quantitative detection of the recombinant SARS-COV-2 nucleoprotein antigen in human serum. It can recognize recombinant SARS-CoV Nucleoprotein / NP Protein, but no react with recombinant MERS-CoV Nucleoprotein / NP protein. The use of this kit for natural samples need be validated by the end user due to the complexity of natural targets and unpredictable interference.