Question

To diagnose a syndromic illness like meningitis, which PCR technique is most appropriate?

• A. Multiplex PCR
• B. Uniplex PCR
• C. Attributed PCR
• D. Nested PCR

Hint:

Multiplex PCR is best when one syndrome can be caused by many organisms.

Answer 1

The Correct Option is A

Step 1: Understanding the Question:
The question asks for the most efficient PCR technique to diagnose a "syndromic illness".
In syndromes like meningitis, several different pathogens (bacteria, viruses, or fungi) can produce nearly identical clinical symptoms, necessitating broad screening.
Step 2: Detailed Explanation:

Definition of Multiplex PCR: This is a variant of the Polymerase Chain Reaction where multiple sets of primers (each specific to a different potential pathogen) are added into a single reaction tube.

Clinical Utility in Syndromic Management:

Comprehensive Screening: A single CSF sample can be tested against a panel of common causes (e.g., S. pneumoniae, N. meningitidis, H. influenzae, HSV, and Enteroviruses) in one run.

Speed: It provides a rapid diagnosis compared to individual cultures or multiple uniplex PCRs, which is critical for life-saving treatment.

Sample Conservation: It requires only a small volume of clinical specimen, which is especially important for cerebrospinal fluid.


Comparison with other techniques:

Uniplex PCR (B): Detects only one specific organism. Not suitable for syndromes with many possible etiologies.

Nested PCR (D): Increases sensitivity for a single target by using two consecutive rounds of PCR. It does not address the need for broad pathogen screening.


Step 3: Final Answer:
Multiplex PCR is the preferred technique for syndromic screening because it can identify multiple different pathogens in a single test.