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For effective treatment of the disease, early diagnosis and understanding its pathophysiology is very important. Which of the following molecular diagnostic techniques is very useful for early detection?
NCERT lists three specific techniques under early molecular diagnosis: Recombinant DNA technology, PCR, and ELISA. Among the 4 options given, ELISA Technique is explicitly listed! Select Option (3) immediately.
Using conventional methods of diagnosis (such as serum analysis, urine culture, or stool examination), early detection is impossible because pathogens are only detected after symptoms appear and pathogen numbers have proliferated to very high levels. When disease symptoms appear, pathogen concentration is already substantial in the body.
Enzyme-Linked Immunosorbent Assay (ELISA) is based on the principle of antigen-antibody interaction: - Infection by a pathogen can be detected either by the presence of minute amounts of antigens (proteins, glycoproteins of pathogen origin) or by detecting antibodies synthesized by the host immune system against the pathogen. - Because enzyme-substrate colorimetric amplification yields immense sensitivity, ELISA detects sub-clinical infections far earlier than conventional laboratory tests.
- Southern Blotting / Hybridization: Used primarily for DNA profiling, gene mapping, or detecting mutated genes in research/forensics, but is not the front-line clinical diagnostic tool highlighted in NCERT for infectious pathophysiology. - Western Blotting: Used as a confirmatory test (e.g. for HIV), but ELISA is the canonical front-line screening and early diagnostic technique highlighted in the NCERT syllabus.
Diagnose every choice: Know exactly why the right option works and why distractors fail.
Incorrect. Western blotting is a confirmatory protein detection method, not the canonical early diagnostic technique highlighted under NCERT Molecular Diagnosis.
Incorrect. Southern blotting identifies specific DNA restriction fragments, not infectious disease pathophysiology in early diagnosis.
Correct. NCERT explicitly designates ELISA along with PCR and rDNA technology as prime tools for early diagnosis based on antigen-antibody detection.
Incorrect. Nucleic acid hybridization with radioactive probes is used to detect mutations in cancer genes, not routine early diagnosis.
Students frequently learn that Western blotting confirms HIV, and thus mistakenly pick Western blotting. However, ELISA is the early screening tool that detects antibodies/antigens at early stages of infection as specified in NCERT.
"Recombinant DNA technology, PCR, and ELISA are techniques that serve the purpose of early diagnosis."
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