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A 25-year-old female is sexually active with a new partner and would like to have an HIV test. The current standard for HIV testing is to start with an enzyme- linked immuno sorbent assay (ELISA). HIV antigens are coated on a plate, and the patient’s serum is added. If the patient has HIV antibodies, binding of these antibodies to the antigens on the plate will be detected. If the test ELISA test is positive, a confirmatory test is done. In this confirmatory test, the patient’s serum is added to HIV antigens, which are on a nitrocellulose membrane. This confirmatory test is a:

A. Northern blot

B. Southern Blot

C. Western Blot

D. Gel electrophoresis

E. Polymerase chain reaction

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