Which of the following methods is adopted for screening HIV infection?
**Core Concept**
The question is testing knowledge of HIV screening methods, which are crucial for early detection and management of the disease. HIV screening involves identifying individuals infected with the Human Immunodeficiency Virus, which can lead to AIDS if left untreated.
**Why the Correct Answer is Right**
The correct answer is the Rapid HIV Test. This method involves using a rapid lateral flow assay to detect the presence of HIV antibodies in a blood sample. The test is usually performed using a finger prick sample and provides results within 20-30 minutes. The rapid test is based on the principle of detecting the p24 antigen or anti-HIV antibodies, which are present in the blood of infected individuals. The test is widely used due to its simplicity, speed, and accuracy.
**Why Each Wrong Option is Incorrect**
* **Option A:** Enzyme-linked immunosorbent assay (ELISA) is a confirmatory test for HIV infection, not a screening method.
* **Option B:** Western blot is a confirmatory test used to confirm the results of an initial screening test, not a screening method itself.
* **Option D:** Polymerase chain reaction (PCR) is a molecular test used to detect the genetic material of HIV, but it is not commonly used for initial screening due to its complexity and cost.
**Clinical Pearl / High-Yield Fact**
It's essential to note that a positive result from a rapid HIV test requires confirmation with a more specific test, such as ELISA or Western blot, to ensure accuracy.
**Correct Answer: C. Rapid HIV Test. Rapid HIV Test is a widely used screening method for detecting HIV infection.**