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Dear Student

Ans 7.
Yes, a disease can be detected before it's symptoms appear and this is known as screening.
Screening of diseases can be done using methods such as Polymerase chain reaction, ELISA (enzyme linked immunosorbent assay) etc.
ELISA is based on the principle of antigen-antibody interaction. Infection by pathogen is detected by the presence of antigens (proteins, glycoproteins, etc) or by detecting the antibodies synthesized against the pathogen.

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