Ligands for the linked enzyme are used, which form a chromatophoric product with the correct enzyme. Polyclonal antibodies 2. Monoclonal antibodies 3. A virus particle must be purified to develop this technique. Rabbits must be clean of infections.
Purified antibody is combined with chromatophoric molecule.
Antibody-ligand is tested for specificity against viruses. Sterile flowers o. Masked symptoms 1. Symptoms under particular conditions 2. Two unrelated viruses multiply independently.