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[The reciprocal effect of the causative agents in a mixed infection in burn injury]
1Medical University, Kursk, Russia.
Abstract:
In vitro experiments on the joint cultivation of Pseudomonas aeruginosa, Escherichia coli, staphylococci and in vivo experiments carried out on mice with the experimental mixed infection of a burn injury revealed the pronounced antagonistic action of P. aeruginosa with respect to staphylococci and E. coli. Under the same conditions, in the joint cultivation of P. aeruginosa and fungi of the genus Candida and in the mixed infection of a burn wound caused by the same microorganisms the mutual stimulation of multiplication and a considerable aggravation of the clinical course of a burn wound were observed. The mutual influence of associates in the mixed infection of a burn injury is manifested by an increase in the number of an antibiotic-resistance microorganisms in their populations and, so far as the macroorganism is concerned, in the aggravation of the course of the infectious process and the formation of the pronounced state of immunodeficiency.
Insights
Pseudomonas aeruginosa inhibits Staphylococcus and E. coli but promotes Candida growth. Mixed infections worsen burn wounds and lead to immunodeficiency and antibiotic resistance.
Area of Science:
- Microbiology
- Immunology
- Infectious Diseases
Background:
- Mixed microbial infections, particularly in burn wounds, present complex challenges in treatment.
- Understanding the interactions between different microbial species is crucial for effective therapeutic strategies.
Purpose of the Study:
- To investigate the in vitro and in vivo interactions between Pseudomonas aeruginosa and other common wound pathogens like Escherichia coli, staphylococci, and Candida species.
- To evaluate the impact of these interactions on the clinical course of burn wound infections and host immune response.
Main Methods:
- In vitro co-cultivation experiments were performed with Pseudomonas aeruginosa, Escherichia coli, staphylococci, and Candida species.
- In vivo studies involved inducing mixed infections in mouse burn wound models.
Main Results:
- Pseudomonas aeruginosa exhibited significant antagonistic effects against Staphylococcus and Escherichia coli in co-culture and in vivo burn models.
- Conversely, Pseudomonas aeruginosa demonstrated mutualistic interactions with Candida species, leading to increased proliferation of both microorganisms.
- Mixed infections involving Pseudomonas aeruginosa and Candida significantly aggravated the clinical presentation of burn wounds, increased antibiotic resistance, and induced pronounced immunodeficiency.
Conclusions:
- The interaction dynamics between Pseudomonas aeruginosa and other microbes are highly dependent on the specific species involved.
- Interactions with Candida species exacerbate burn wound infections, promoting microbial growth, antibiotic resistance, and host immunosuppression.
- These findings highlight the critical need to consider polymicrobial interactions in managing complex infections like those in burn injuries.