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[Pathogenicity of clinical strains of Pseudomonas aeruginosa]
Abstract:
The study of 208 Ps. aeruginosa clinical strains, introduced intraperitoneally into white mice, revealed the statistically significant prevalence of pathogenic cultures (87.5--100%). The pathogenic strains of Ps. aeruginosa were found to have statistically significant differences in their cultural and biochemical properties depending on the kind of clinical material: the strains isolated from blood formed mucoid colonies, the zones of hemolysis and thermolabile or thermostable alkaline phosphatase, and typing could be made in 100% of the isolated cultures; the strains isolated from material of closed cavities formed mucoid colonies and the zones of hemolysis; the pathogenic strains isolated from material of open cavities showed only a tendency towards greater activity in the formation of extracellular sline and greater capacity for the formation of clarification zones on yolk agar as compared with nonpathogenic cultures.
Insights
Pathogenic Pseudomonas aeruginosa strains are highly prevalent in clinical settings. Their cultural and biochemical properties vary significantly based on the origin of the clinical sample, impacting identification and characterization.
Area of Science:
- Microbiology
- Clinical Bacteriology
- Infectious Diseases
Background:
- Pseudomonas aeruginosa is an opportunistic pathogen frequently isolated from clinical specimens.
- Understanding the variability of P. aeruginosa clinical isolates is crucial for effective diagnosis and treatment.
- Previous studies have highlighted the heterogeneity of P. aeruginosa strains, but specific correlations with clinical source require further elucidation.
Purpose of the Study:
- To investigate the prevalence of pathogenic Pseudomonas aeruginosa in clinical samples.
- To analyze the cultural and biochemical properties of P. aeruginosa strains in relation to their clinical source.
- To determine if specific characteristics correlate with pathogenicity and clinical origin.
Main Methods:
- In vivo study involving intraperitoneal inoculation of 208 clinical isolates of P. aeruginosa into white mice.
- Assessment of pathogenicity, including mortality rates and characteristic signs.
- Evaluation of cultural properties (colony morphology, hemolysis) and biochemical tests (alkaline phosphatase activity, extracellular slime production, yolk agar clarification).
Main Results:
- A high prevalence of pathogenic P. aeruginosa strains was observed (87.5--100%).
- Significant differences in cultural and biochemical properties were noted among strains from different clinical sources.
- Strains from blood exhibited mucoid colonies, hemolysis, and alkaline phosphatase activity, enabling 100% typing. Strains from closed cavities showed mucoid colonies and hemolysis. Strains from open cavities tended towards increased extracellular slime and yolk agar clarification.
Conclusions:
- Pathogenic P. aeruginosa strains are highly prevalent in clinical settings.
- The cultural and biochemical profiles of P. aeruginosa are significantly influenced by the clinical source of isolation.
- These source-dependent variations can aid in the identification and characterization of pathogenic P. aeruginosa strains.