Final answer:
ELISA is used to determine HIV positivity and is confirmed by Western Blot and PCR tests.
Explanation:
ELISA (Enzyme-Linked Immunosorbent Assay) is the test used to determine if a person is HIV positive. It works by detecting anti-HIV antibodies that bind to HIV peptides, confirming the presence of the virus.
Western Blot and PCR tests are used to confirm positive ELISA results and diagnose HIV. These tests help in identifying specific peptides or nucleic acids associated with the virus.
HIV screening is crucial as early detection leads to timely treatment, preventing further spread of the virus.
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