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New serotypes of Treponema hyodysenteriae
Abstract:
Three isolates of pathogenic Treponema hyodysenteriae, B8044, B6933, and Ack 300/8, were serotyped by double immunodiffusion using lipopolysaccharide antigen and rabbit antiserum. The precipitation reactions of these three isolates were then compared with precipitin reactions from the reference strains of serotypes 1 through 4. The data indicated that B8044, B6933, and Ack 300/8 share antigenic determinants with either serotype 1 or 2 or both. However, when the cross-reacting antibodies were removed by adsorption, all reactions were found to be monospecific. Based on these results, three new serotypes of pathogenic T. hyodysenteriae are proposed: B8044 serotype 5, B6933 serotype 6, and Ack 300/8 serotype 7.
Insights
Three pathogenic Treponema hyodysenteriae isolates were serotyped, revealing shared antigens with existing types. Adsorption confirmed unique specificities, leading to the proposal of three new serotypes: 5, 6, and 7.
Area of Science:
- Veterinary Microbiology
- Immunology
- Bacteriology
Background:
- Treponema hyodysenteriae is a significant swine pathogen.
- Accurate serotyping is crucial for disease control and epidemiological studies.
- Existing serotypes of T. hyodysenteriae do not fully encompass all pathogenic variants.
Purpose of the Study:
- To serotype three specific isolates of pathogenic Treponema hyodysenteriae (B8044, B6933, and Ack 300/8).
- To compare the antigenic properties of these isolates with established reference serotypes.
- To propose new serotypes based on distinct antigenic profiles.
Main Methods:
- Double immunodiffusion assays were performed using lipopolysaccharide (LPS) antigen from the isolates and rabbit antiserum.
- Precipitation reactions were compared against reference strains of T. hyodysenteriae serotypes 1 through 4.
- Cross-reacting antibodies were removed through adsorption to confirm monospecificity.
Main Results:
- Isolates B8044, B6933, and Ack 300/8 exhibited shared antigenic determinants with serotypes 1 and/or 2.
- Adsorption experiments demonstrated that each isolate possessed unique antigenic specificities.
- The three isolates were antigenically distinct from reference serotypes 1-4 after adsorption.
Conclusions:
- The findings support the antigenic distinctness of the three T. hyodysenteriae isolates.
- Three new serotypes are proposed for pathogenic Treponema hyodysenteriae: serotype 5 (B8044), serotype 6 (B6933), and serotype 7 (Ack 300/8).
- This expanded serotyping scheme aids in better understanding T. hyodysenteriae epidemiology and control.