Pathogenicity of Streptomyces griseus for laboratory mice
Related Experiment Videos
1Department of Microbiology, University of Nigeria, Nsukka.
Abstract:
Streptomyces griseus, an aerobic actinomycete usually regarded as a saprophyte, was found to be virulent for laboratory mice both by intraperitoneal and intravenous routes of inoculation, the latter route producing a more progressive and disseminating infection. Suspension in mucin resulted in higher mortality and more extensive lesions, often leading to membranous adhesions of some visceral organs. The lesions appeared as nodules containing granules of Str. griseus. The pathogenicity of Str. griseus is compared with that of Str. somaliensis from published reports.
Insights
Streptomyces griseus, typically a soil microbe, demonstrates virulence in mice, causing disseminated infections and organ adhesions. This study highlights its potential pathogenicity, contrasting it with related species.
Area of Science:
- Microbiology
- Pathogen Discovery
Background:
- Streptomyces griseus is commonly classified as a saprophyte.
- Limited information exists regarding the pathogenic potential of S. griseus in vivo.
Purpose of the Study:
- To investigate the virulence of Streptomyces griseus in a laboratory setting.
- To characterize the infection and lesions caused by S. griseus in mice.
- To compare the pathogenicity of S. griseus with Streptomyces somaliensis.
Main Methods:
- Intraperitoneal and intravenous inoculation of laboratory mice with Streptomyces griseus.
- Administration of S. griseus suspended in mucin to assess enhanced virulence.
- Histopathological examination of infected tissues to identify lesion characteristics.
Main Results:
- Streptomyces griseus exhibited virulence in mice via both inoculation routes.
- Intravenous inoculation led to more progressive and disseminated infections.
- Mucin suspension increased mortality rates and caused extensive lesions, including visceral organ adhesions.
- Lesions were characterized as nodules containing granules of S. griseus.
Conclusions:
- Streptomyces griseus possesses significant pathogenic potential, challenging its saprophytic classification.
- The virulence of S. griseus is influenced by the route of inoculation and host factors like mucin.
- Further research is warranted to understand the mechanisms of S. griseus pathogenicity and its clinical relevance.