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Updated: Jun 19, 2026

Determining the Reactivity and Titre of Serum using a Haemagglutination Assay
Published on: January 29, 2010
STUDIES ON THE PRECIPITIN REACTION : PRECIPITATING HAPTENS; SPECIES DIFFERENCES IN ANTIBODIES
1Department of Medicine, College of Physicians and Surgeons of Columbia University and the Presbyterian Hospital, New York.
Researchers isolated specific Type III pneumococcus polysaccharide fragments. These fragments react with horse serum but only inhibit rabbit antisera, offering insights into immune responses and potential applications.
Area of Science:
- Immunochemistry
- Bacterial Polysaccharides
Background:
- Type III pneumococcus is a significant pathogen.
- Understanding its capsular polysaccharide (S III) is crucial for vaccine development and diagnostics.
- Previous studies have characterized the basic structure of S III.
Purpose of the Study:
- To investigate the immunological properties of partial hydrolysis products of Type III pneumococcus polysaccharide.
- To differentiate the reactivity of these fragments with different antisera.
- To explore potential applications based on observed immunological interactions.
Main Methods:
- Partial hydrolysis of Type III pneumococcus polysaccharide.
- Quantitative separation of hydrolysis products from unhydrolyzed polysaccharide.
- Immunoprecipitation assays using Type III antipneumococcus horse serum and homologous rabbit antisera.
- Analysis of aldobionic acid, the structural unit of S III.
Main Results:
- Specific polysaccharide fragments (550-1,800 formula weight) were successfully isolated.
- These fragments formed specific precipitates with Type III antipneumococcus horse serum.
- The same fragments caused specific inhibition but not precipitation with homologous rabbit antisera.
- Aldobionic acid did not precipitate antisera.
Conclusions:
- The differential reactivity suggests distinct antigenic determinants on the polysaccharide fragments.
- Findings may aid in developing more specific diagnostic tools or therapeutic strategies targeting Type III pneumococcus.
- Further research is warranted to elucidate the precise mechanisms and applications.
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