Related Experiment Videos
Morphology of three strains of contagious equine metritis organism
Abstract:
Examination of recently isolated cultures of three strains of Contagious Equine Metritis Organism grown on specially formulated, serum-free, clear typing medium revealed the presence of numerous colonial opacity variants. These colonies were prepared by a number of fixation and staining techniques and examined by scanning and transmission electron microscopy. Opaque and transparent phenotypes produced copious amounts of extracellular material compared with intermediate-opacity phenotypes which produced little or none. Also unique to intermediate colonies were numerous thin intercellular strands, which may represent pili or polymers of extracellular material. The presence of an unusual fibrillar layer (with similar electron density to the extracellular material) on the outer leaf of the outer membrane also was confirmed. A number of other ultrastructural features also were noted, including an epilayer, a thin nonmembranous layer which covered colonies and adjacent agar.
Insights
Colonial opacity variants in Contagious Equine Metritis Organism (CEMO) were examined. Intermediate opacity strains showed unique ultrastructural features, including intercellular strands and fibrillar layers, distinct from opaque and transparent variants.
Area of Science:
- Veterinary Microbiology
- Bacterial Ultrastructure
- Equine Infectious Diseases
Background:
- Contagious Equine Metritis Organism (CEMO) causes significant reproductive losses in horses.
- Colonial morphology can indicate variations in bacterial physiology and virulence.
- Understanding CEMO ultrastructure is crucial for developing effective diagnostic and control strategies.
Purpose of the Study:
- To investigate the ultrastructural differences between colonial opacity variants of CEMO.
- To characterize the extracellular material and outer membrane structures of different CEMO phenotypes.
- To identify potential virulence factors associated with specific colonial variants.
Main Methods:
- Cultivation of three CEMO strains on a specialized serum-free medium.
- Application of various fixation and staining techniques for microscopy.
- Examination using scanning and transmission electron microscopy (SEM/TEM).
Main Results:
- Opaque and transparent CEMO phenotypes produced abundant extracellular material.
- Intermediate-opacity phenotypes exhibited minimal extracellular material but possessed unique intercellular strands, possibly pili.
- An unusual fibrillar layer on the outer membrane and an epilayer covering colonies were observed.
Conclusions:
- Colonial opacity in CEMO correlates with distinct ultrastructural characteristics and extracellular matrix production.
- Intermediate-opacity variants may possess unique surface structures (e.g., pili) with implications for adhesion or virulence.
- Further research into these ultrastructural variations could reveal novel targets for therapeutic intervention.