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Proteus morgani is less frequently associated with urinary tract infections than Proteus mirabilis--an explanation
Abstract:
The metabolic activities of faecal and urinary strains of Proteus morgani and P. mirabilis were compared. Regardless of origin, the generation time of P. morgani strains in urine was approximately twice as long as that of the P. mirabilis strains. Urease synthesis was constitutive in P. morgani strains but required induction with urea in the P. mirabilis strains. In the presence of urea, the P. mirabilis strains liberated ammonia more rapidly and produced alkaline conditions more quickly than P. morgani strains, although they synthesized much less urease. These characteristics may place P. morgani strains at a disadvantage in comparison with P. mirabilis strains in their ability to cause urinary tract infections.
Insights
Proteus mirabilis strains grow faster and alkalinize urine more quickly than Proteus morgani strains, potentially impacting their ability to cause urinary tract infections (UTIs). This study compared metabolic activities of these common UTI pathogens.
Area of Science:
- Microbiology
- Urology
- Infectious Diseases
Background:
- Proteus species are common causes of urinary tract infections (UTIs).
- Understanding the metabolic differences between Proteus strains is crucial for predicting their pathogenicity.
Purpose of the Study:
- To compare the metabolic activities of fecal and urinary strains of Proteus morgani and Proteus mirabilis.
- To elucidate the differential characteristics that may influence their roles in UTIs.
Main Methods:
- Comparative analysis of metabolic activities, including generation time and urease synthesis.
- Incubation of bacterial strains in urine and assessment of ammonia production and pH changes.
Main Results:
- Proteus morgani strains exhibited a longer generation time in urine compared to Proteus mirabilis strains.
- Urease synthesis was constitutive in P. morgani but inducible by urea in P. mirabilis.
- P. mirabilis liberated ammonia and increased urine alkalinity faster than P. morgani, despite synthesizing less urease.
Conclusions:
- Proteus mirabilis possesses metabolic advantages over Proteus morgani in the urine environment.
- These differences may explain the varying success rates of these bacteria in causing UTIs.