Paper I — 2023 July (Supplementary) (2010 Scheme) — Q9

Paper I

2023 July (Supplementary) (2010 Scheme) · 40 marks · 120 min

Question

Name any two antigen-antibody reactions.

Q92 marksShort Notes★✓

Answer

Two examples of antigen-antibody reactions:

1. Agglutination — clumping of a particulate antigen (whole cells, or antigen adsorbed onto a carrier particle) when it reacts with specific antibody, cross-linking particles into visible aggregates (e.g., Widal test, blood grouping).
2. Precipitation — formation of a visible insoluble complex when a soluble antigen reacts with specific antibody in optimal proportions (e.g., Elek’s gel precipitation test, VDRL flocculation test).

(Other valid examples: complement fixation, neutralization, immunofluorescence, ELISA.)

Related Concepts

1. 1Enteric (Typhoid) Fever

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