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Can a disease be detected before its sym...

Can a disease be detected before its symptoms appear ? Explain the principle involved ?

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Yes, Recombinant DNA technology, Polymerase Chain Reaction (PCR) and Enzyme Linked Immuno Sorbent Assay (ELISA) are some of the techniques that .serve early diagnosis before symptoms, appear. Very low concentration of a bacteria or virus (at the time when the symptoms of the disease are not yet-visible).can be detected by amplification of their nucleic acid through PCR.
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