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Which one of the following techniques does not serve the purpose of early diagnosis of a disease for its early treatment?
A
Enzyme Linked Immuno-Sorbent Assay (ELISA) technique
B
Recombinant DNA Technology
C
Serum and Urine analysis
D
Polymerase Chain Reaction (PCR) technique
Explanation
PCR, ELISA and rDNA technology detect infection early; serum and urine analysis does not.
Detailed Solution
Of these, serum and urine analysis does not fulfil the purpose of early diagnosis of a disease. In early stages of infections, when the disease symptoms are not visible, amplification of pathogenic nucleic acid can be done by PCR, detection of antibodies produced by host against pathogen by ELISA and rDNA technology can serve the purpose of early diagnosis.