◆This kit uses immunochromatography. The test card contains:1)colloidal gold-labeled recombinant novel coronavirus S-RBD antigen and quality control antibody gold markers; 2) one detection line(T line) and one quality Control line (C line) of nitrocellulose membrane. The T line is immobilized with Human ACE2 protein for detecting novel coronavirus neutralizing antibody and the C line is immobilized with a quality control antibody.

◆When an appropriate amount of the test sample is added to the sample hole of the test card, the sample will move forward along the test card under the action of the capillary. If the sample contains novel coronavirus neutralizing antibody, the antibody will bind to the colloidal gold-labeled novel coronavirus antigen. The rest gold-labeled novel coronavirus antigen in immune complex will be captured by the human ACE2 protein immobilized on

the membrane to form a purple-red T line, the intensity of t line Inversely proportional to the concentration of antibody.

◆The test card also contains a quality control line C .The fuchsia quality control line C should appear regardless of whether a test line appears. If the quality control line C does not appear, the test result is invalid, and the sample needs to be tested again with another test card.