NEET BIOLOGY

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BIOLOGICAL CLASSIFICATION

PRIONS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Diagnosis of viral infections sometimes involves analyzing the patient’s blood for specific ____ that the immune system produces against the virus.
A
antibodies
B
antigens
C
complement proteins
D
glycoproteins
Explanation: 

Detailed explanation-1: -Enzyme immunoassays (EIA or ELISA) for detection of virus and/or viral antigen.

Detailed explanation-2: -Serology testing for the presence of virus-elicited antibodies in blood is one of the methods used commonly for clinical diagnosis of viral infections.

Detailed explanation-3: -Immunofluorescence or immunoperoxidase assays are commonly used to detect whether a virus is present in a tissue sample. These tests are based on the principle that if the tissue is infected with a virus, an antibody specific to that virus will be able to bind to it.

Detailed explanation-4: -At least three immunoglobulin classes have been demonstrated to exert antiviral activity: IgG, IgM, and IgA. These antibodies can neutralize the infectivity of virtually all known viruses. Antibody binds to the virus extracellularly, either neutralizing it immediately or blocking its interaction with host cells.

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