Humasis COVID-19 Ag Test uses monoclonal antibodies specific to COVID-19 antigens to detect COVID-19 specific antigens in human nasal swab and nasopharyngeal swab specimens.
The test results are more accurate because the test contains 2 antibodies - monoclonal antibody against SARS-CoV-2 nucleocapsid and monoclonal antibody specific to RBD against SARS-CoV-2 spike protein, most manufacturers use only one Ab.
A nitrocellulose membrane strip in the device contains one test line and one control line. The test line is pre-coated with anti-mouse monoclonal antibody to SARS-CoV-2 nucleocapsid and RBD for detection of SARS-CoV-2 antigens, and the control line is coated with goat anti-mouse IgG.
When the extracted swab specimen is added to the sample well, it will migrate to the conjugate pad, which contains conjugated antibodies conjugated with colloidal gold directed against the SARS-CoV-2 antigen. If the sample contains SARS-CoV-2 antigens, antigen-antibody-conjugate complex will be formed. The complex will continue to migrate across the membrane until it reaches the capture zone (test line) where the complex will bind to immobilized antibodies and form visible colored band in the test line. The sample will continue to move along the membrane until it reaches the control line where excess conjugate binds and produces a second visible line. This control line indicates that the sample has migrated across the membrane as intended and the test was performed properly.