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An HIV infected individual will show a ...

An HIV infected individual will show a negative result for an antibody-antigen based test if the body has not produced antibodies. For such a situation, which of the following test could be used to confirm the presence of HIV?

A

MRI

B

PCR

C

ELISA

D

Widal test

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding which test could be used to confirm the presence of HIV in an individual who shows a negative result for an antibody-antigen based test, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding the Context**: The question states that an HIV-infected individual may show a negative result in an antibody-antigen based test if the body has not yet produced antibodies. This situation is common in the early stages of HIV infection, known as the "window period." 2. **Evaluating the Options**: The options provided are: - A) MRI - B) PCR - C) ELISA - D) VDRL test 3. **Analyzing Each Option**: - **A) MRI**: This test is used for imaging internal organs and is not relevant for detecting HIV. Therefore, this option is incorrect. - **B) PCR (Polymerase Chain Reaction)**: This test detects the genetic material of the virus (HIV RNA or DNA) and can identify the presence of HIV even when antibodies are not yet produced. This makes it a suitable option for early detection. - **C) ELISA**: This test is based on the detection of antibodies against HIV. Since the question specifies that antibodies have not been produced, this test would yield a negative result. Thus, this option is incorrect. - **D) VDRL test**: This is a non-specific test for syphilis and does not detect HIV. Therefore, this option is also incorrect. 4. **Conclusion**: Based on the analysis, the only test that can confirm the presence of HIV in the absence of antibodies is the **PCR test**. ### Final Answer: **B) PCR (Polymerase Chain Reaction)** ---
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