Related Experiment Video
Updated: Jun 19, 2026
Opsono-Adherence Assay to Evaluate Functional Antibodies in Vaccine Development Against Bacillus anthracis and Other Encapsulated Pathogens
Published on: May 19, 2020
NOTES UPON THE AGGLUTINATIONS OBTAINED BY INTRAPERITONEAL INSERTION OF CELLOIDIN CAPSULES CONTAINING BACILLI AND UPON
1J. H. R. Molson Pathological Laboratory, McGill University, Montreal.
Abstract:
1. Capsules made as described above allow dialysis, when placed in the peritoneal cavity. 2. The normal tissues, unstimulated, do not possess the power of causing agglutination; they do not require to be stimulated by the presence of the bacterial bodies, but will produce their share of the agglutinins when acted upon by the bacillary products. 3. Agglutination follows the insertion, in the peritoneal cavity, of "capsuled" bacilli; it gradually increases in degree, and on the removal of the capsule containing the bacilli, begins to disappear. 4. Varieties of bacilli, related closely in morphology and cultural reactions, do not, as a rule, produce serums which inter-agglutinate.
Insights
Normal tissues produce agglutinins when exposed to bacterial products, not bacterial bodies themselves. Encapsulated bacteria in the peritoneal cavity induce agglutination that subsides upon capsule removal.
Area of Science:
- Immunology
- Microbiology
Background:
- Normal tissues do not spontaneously cause agglutination.
- Bacterial products, not whole bacteria, stimulate agglutinin production.
Purpose of the Study:
- To investigate the role of bacterial capsules in inducing agglutination.
- To understand the interaction between bacterial products and host immune response.
Main Methods:
- Utilizing specialized capsules for bacterial containment within the peritoneal cavity.
- Observing agglutination responses following the insertion and removal of encapsulated bacilli.
Main Results:
- Agglutination was observed after inserting "capsuled" bacilli into the peritoneal cavity.
- The degree of agglutination increased over time and decreased after capsule removal.
- Closely related bacterial varieties generally did not produce cross-reactive serums.
Conclusions:
- Bacterial capsules play a role in initiating the agglutination response.
- The immune system's agglutinin production is stimulated by bacterial products.
- Specific bacterial strains may elicit distinct immune responses.
