Rabies is diagnosed by ?
**Core Concept**
Rabies diagnosis involves detecting the presence of the rabies virus or its antigens in animal tissues, human tissues, or bodily fluids. This is typically achieved through laboratory tests that identify the virus's genetic material or the immune response it elicits in infected individuals.
**Why the Correct Answer is Right**
The correct answer is based on the principle of detecting viral antigens or antibodies using laboratory tests. In rabies diagnosis, the most commonly used test is the Fluorescent Antibody Test (FAT), which detects the presence of rabies virus antigens in brain tissue. Another method is the Polymerase Chain Reaction (PCR), which amplifies the viral genome to detect the presence of rabies virus DNA. The presence of rabies virus-neutralizing antibodies in the blood can also be used to diagnose the disease.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is likely incorrect because it does not specify a valid laboratory test for rabies diagnosis. While some tests may involve the use of fluorescent dyes, FAT is the specific test that involves fluorescent dyes.
* **Option B:** This option is likely incorrect because it does not specify a valid laboratory test for rabies diagnosis. While some tests may involve the use of PCR, the presence of rabies virus DNA is what is being detected, not the presence of a specific protein or enzyme.
* **Option C:** This option is likely incorrect because it does not specify a valid laboratory test for rabies diagnosis. While some tests may involve the use of enzyme-linked immunosorbent assay (ELISA), this option does not provide enough information to determine whether it is a specific test for rabies.
**Clinical Pearl / High-Yield Fact**
It is essential to note that early diagnosis and prompt treatment with post-exposure prophylaxis (PEP) are critical to prevent rabies in individuals who have been bitten or exposed to potentially rabid animals.
**Correct Answer: D. Fluorescent Antibody Test (FAT) for detecting rabies virus antigens in brain tissue.**