Question : Can a disease be detected before its symptoms appear ? Expl – InterviewSolution

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1.	Question : Can a disease be detected before its symptoms appear ? Explain the principle involved.
Answer» Solution :Presence of a PATHOGEN (bacteria, viruses, etc.) is normally suspected only when the pathogen has produced a disease symptom. By this time the concentration of pathogen is ALREADY very HIGH in the body. However, very low concentration of a bacteria or virus (at a time when the symptoms of the disease are not yet visible) can be detected by AMPLIFICATION of their nucleic acid by PCR (Polymerase Chain REACTION).

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