Related Experiment Videos
Characterization and quantitation of experimental surgical-wound infections used to evaluate topical antibacterial
Abstract:
Reproducible experimental surgical-wound infections in mice for use in the evaluation of topical antibacterial agents are described. The experimental would was created on the backs of mice by means of a midline incision and was infected by means of cotton sutures monocontaminated with Staphylococcus aureus or Pseudomonas aeruginosa. The course of these wound infections was followed by quantitation of surface bacteria through use of a surface rinse technique. Surface wound counts of the infecting organisms thus obtained appeared to reflect the dynamics of the total wound count, as determined by homogenization of biopsied tissue. Treatment of infected wounds with a placebo cream had only a slight effect on surface wound counts and on mortality in the case of the S. aureus infection but enhanced markedly the lethality of the P. aeruginosa infection.
Insights
This study details a reproducible mouse model for surgical-wound infections to test topical antibacterial agents. The model effectively tracks bacterial growth and shows differing outcomes for Staphylococcus aureus and Pseudomonas aeruginosa infections when treated with placebo.
Area of Science:
- Microbiology
- Infectious Diseases
- Animal Models
Background:
- Evaluating topical antibacterial agents requires reliable experimental models.
- Surgical-wound infections are a significant clinical challenge.
- Standardized infection models are crucial for reproducible research.
Purpose of the Study:
- To describe a reproducible mouse model for experimental surgical-wound infections.
- To utilize this model for evaluating the efficacy of topical antibacterial agents.
- To investigate the dynamics of Staphylococcus aureus and Pseudomonas aeruginosa wound infections.
Main Methods:
- Created surgical wounds on mouse backs via midline incision.
- Infected wounds using cotton sutures monocontaminated with Staphylococcus aureus or Pseudomonas aeruginosa.
- Quantified surface bacteria using a surface rinse technique to monitor infection progression.
Main Results:
- Surface bacterial counts correlated with total bacterial counts from homogenized tissue.
- Placebo cream showed minimal effect on Staphylococcus aureus wound counts and mortality.
- Pseudomonas aeruginosa infections were markedly more lethal when treated with placebo cream.
Conclusions:
- The described mouse model provides a reproducible system for studying wound infections.
- This model is suitable for the in vivo evaluation of topical antibacterial therapies.
- Differential responses to infection and placebo treatment were observed between Staphylococcus aureus and Pseudomonas aeruginosa.