Final answer:
A monoclonal antibody can be used to detect an STI using a urine sample through a lateral flow test. The test involves applying the urine sample to a test strip that contains antibodies attached to beads. A colored line indicates the presence of the STI.
Step-by-step explanation:
A monoclonal antibody can be developed and used to detect an STI using a urine sample through a technique called lateral flow test. In this test, the urine sample is applied to an absorbent pad on a test strip which contains antibodies attached to beads. These antibodies will bind to the antigens present in the urine that are specific to the STI. The complexes of antibody-antigen move through a second stripe that has immobilized antibody against the antigen, and this stripe will retain the antibody-bead complexes. If a positive test is being performed, a colored line will develop at the test line, indicating the presence of the STI. If the color only develops at the control line, the test is negative.