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[Hepatotropism of Tyzzer bacteria in experimentally infected chick embryos]
Comptes Rendus Des Seances De La Societe De Biologie Et De Ses Filiales
|January 1, 1975
Abstract:
Tyzzer's organism from mice propagated more remarkably in hepatocytes than in yolk-sac epithelial cells producing confluent necrosis of the liver after intravenous as well as intravitelline inoculation. Some lesions with bacterial growth were also produced in the heart muscles and kidneys. The organisms from mouse, rat, hamster and kitten were shown to be equally pathogenic for chick embryos.
Insights
Tyzzer's organism primarily infects mouse hepatocytes, causing liver necrosis. This bacterial pathogen also affects other organs and is equally harmful to chick embryos across different animal hosts.
Area of Science:
- Veterinary Pathology
- Microbiology
- Infectious Diseases
Background:
- Tyzzer's disease is caused by a bacterium, *Clostridium piliformis* (formerly *Bacillus piliformis*).
- This organism is known to infect various animal species, including rodents and rabbits.
- Understanding its pathogenesis and host-cell tropism is crucial for disease management.
Purpose of the Study:
- To investigate the replication and pathogenicity of Tyzzer's organism in different cell types.
- To compare the infectivity of Tyzzer's organism from various animal hosts in a chick embryo model.
Main Methods:
- Inoculation of Tyzzer's organism into mouse hepatocytes and yolk-sac epithelial cells.
- Intravenous and intravitelline inoculation of infected material into chick embryos.
- Histopathological examination of infected tissues to assess bacterial growth and tissue damage.
Main Results:
- Tyzzer's organism replicated more effectively in hepatocytes than in yolk-sac epithelial cells.
- Confluent liver necrosis was observed following inoculation in mice.
- Lesions and bacterial growth were also noted in the heart muscles and kidneys of infected mice.
- Organisms derived from mice, rats, hamsters, and kittens exhibited equal pathogenicity in chick embryos.
Conclusions:
- Hepatocytes are a primary replication site for Tyzzer's organism, leading to significant liver pathology.
- The organism can cause systemic disease affecting multiple organs.
- Chick embryos serve as a suitable model for assessing the pathogenicity of Tyzzer's organism across different host species.