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Adhesion of Haemophilus paragallinarum to cultured chicken cells
Abstract:
Adhesion of Haemophilus paragallinarum to chicken embryo fibroblasts (CEF) in vitro was investigated in correlation with its virulence. Under the scanning electron microscope, the organisms were seen adhering to CEF exposed to the bacteria. By transmission electron microscopy, the organisms appeared to attach to the plasma membrane of CEF by their fuzzy material. They were enclosed in membrane-limited vesicles and appeared morphologically intact. Specific fluorescence was seen in the cytoplasm of CEF in later stages of infection. There was a good correlation between pathogenicity of the organisms for chickens and their ability to adhere to CEF. This correlation was reinforced by the fact that the ability of a pathogenic strain to adhere to the mucosal surface of the chicken trachea was demonstrated by scanning electron microscopy.
Insights
Haemophilus paragallinarum adhesion to chicken cells correlates with disease severity. This bacterial attachment mechanism is crucial for understanding fowl వ్యాధి pathogenesis and developing effective control strategies.
Area of Science:
- Veterinary Microbiology
- Cell Biology
- Bacterial Pathogenesis
Background:
- Haemophilus paragallinarum is a significant avian pathogen.
- Understanding bacterial adhesion mechanisms is key to controlling infectious diseases.
- Chicken embryo fibroblasts (CEF) serve as a model for studying host-pathogen interactions.
Purpose of the Study:
- To investigate the in vitro adhesion of Haemophilus paragallinarum to CEF.
- To correlate bacterial adhesion with virulence in chickens.
- To elucidate the ultrastructural basis of H. paragallinarum adhesion.
Main Methods:
- Scanning electron microscopy (SEM) to visualize bacterial adherence to CEF and chicken trachea.
- Transmission electron microscopy (TEM) to examine the ultrastructure of bacterial attachment.
- Virulence assessment in chicken models.
Main Results:
- H. paragallinarum adhered to CEF, with attachment mediated by bacterial surface structures.
- Organisms were internalized within membrane-bound vesicles in CEF.
- A strong correlation was observed between the pathogenicity of H. paragallinarum strains and their ability to adhere to CEF.
- SEM confirmed adhesion to the chicken tracheal mucosa.
Conclusions:
- Bacterial adhesion to host cells is a critical factor in H. paragallinarum virulence.
- The study provides insights into the mechanism of H. paragallinarum infection.
- Adhesion to CEF and tracheal mucosa can serve as indicators of pathogenicity.