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Experimentally induced Bacteroides infections in the rabbit
Abstract:
Rabbits were infected with Bacteroides fragilis, B. macacae and B. gingivalis in monoinfection, mixed Bacteroides infection, and mixed infection of B. gingivalis with Streptococcus faecalis, Escherichia coli and Clostridium sporogenes. Monoinfection gave rise to localised, nodular abscesses at cell levels greater than 0.5 X 10(5) cfu ml-1, the severity of which was dose related. Mixed infections including B. gingivalis caused severe spreading lesions and affected organs distant from the injection site. Histopathological studies indicate an inflammatory response with gas vacuolation and local necrosis.
Insights
Bacterial infections in rabbits, including Bacteroides fragilis and Bacteroides gingivalis, caused localized abscesses. Mixed infections with B. gingivalis led to severe spreading lesions and tissue damage.
Area of Science:
- Microbiology
- Pathology
- Infectious Diseases
Background:
- Bacteroides species are common inhabitants of the human gut microbiome.
- Understanding their pathogenic potential is crucial for infectious disease research.
Purpose of the Study:
- To investigate the pathogenicity of Bacteroides fragilis, Bacteroides macacae, and Bacteroides gingivalis in a rabbit infection model.
- To compare the effects of monoinfections versus mixed infections involving these bacteria.
Main Methods:
- Rabbits were inoculated with specific bacterial strains (B. fragilis, B. macacae, B. gingivalis) in monoinfections and various mixed infection combinations.
- Infection severity and lesion development were monitored.
- Histopathological analysis was performed to examine tissue responses.
Main Results:
- Monoinfections with Bacteroides species resulted in localized, dose-dependent abscess formation.
- Mixed infections, particularly those including B. gingivalis, caused severe, spreading lesions affecting distant organs.
- Histopathology revealed inflammatory responses, gas vacuolation, and local necrosis.
Conclusions:
- Bacteroides species can cause significant pathology in rabbits.
- Mixed infections involving B. gingivalis exhibit enhanced virulence, leading to disseminated disease.
- These findings highlight the importance of polymicrobial interactions in bacterial pathogenesis.
