SARS-CoV-2 IgG ELISA Kit is designed for the qualitative measurement of the human SARS-CoV-2 IgG. ELISA detects human antibodies to COVID. So, It is not possible to correlate +/- results from SARS-CoV-2 IgG ELISA Kit ENZ-KIT170 to pfu/ml of the virus. Positive and Negative Controls in this kit yields plus/minus results based on the cut-off OD values (COV).