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[Virulence of Pseudomonas aeruginosa]
Abstract:
A study was made of the virulence of 137 strains of P. aeruginosa on a model of intraperitoneal infection of albino mice. The graded index of the 1/T effect (the value reverse to the time of mouse death, in days) was in direct relationship to the log of the culture dose. The optimal infective dose in tesing the strain virulence was a dose equal to 10-8-5 microbial cells. The virulence index V was a satisfactory index characterizing the strain virulence in the selected model of infection. V values of the strains studied were subject to the law of normal distribution. P. aeruginosa virulence failed to depend on the periods of strain storage (museum and freshly isolated) their origin (from man or animals) and the source of isolation (different localization of diseases in man).
Insights
This study evaluated Pseudomonas aeruginosa (P. aeruginosa) virulence in mice, finding a direct relationship between bacterial dose and mortality. The virulence index V proved reliable, unaffected by strain storage or origin.
Area of Science:
- Microbiology
- Infectious Diseases
- Animal Models
Background:
- Pseudomonas aeruginosa (P. aeruginosa) is an opportunistic pathogen.
- Accurate virulence assessment is crucial for understanding P. aeruginosa pathogenicity.
Purpose of the Study:
- To evaluate the virulence of 137 P. aeruginosa strains.
- To establish a reliable method for assessing P. aeruginosa strain virulence.
Main Methods:
- Intraperitoneal infection model using albino mice.
- Quantification of virulence using the 1/T effect (reciprocal of time to death).
- Determination of optimal infective dose and analysis of virulence index V.
Main Results:
- A direct correlation was observed between bacterial dose and mortality (1/T effect).
- An optimal infective dose of 10^8.5 microbial cells was identified.
- The virulence index V effectively characterized strain virulence and followed normal distribution.
Conclusions:
- P. aeruginosa virulence is dose-dependent in this mouse model.
- The virulence index V is a robust measure for P. aeruginosa strain virulence.
- Strain storage duration, origin (human/animal), and isolation source did not impact virulence.