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Updated: Feb 19, 2026

Antibiotic Efficacy Testing in an Ex vivo Model of Pseudomonas aeruginosa and Staphylococcus aureus Biofilms in the Cystic Fibrosis Lung
Published on: January 22, 2021
DEFINITION OF ETIOLOGICAL ANTIBIOTIC SENSITIVITY FACTORS IN PURULENT-INFLAMMATORY PROCESSES
O Dubovyk1, М Mishyna1, S Malanchuk1
1Kharkiv National Medical University, D.P. Grinyov Department of microbiology, virology and immunology; V.N. Karazin Kharkov National University, Department of general and clinical immunology and allergology, Ukraine.
This study found that common bacteria like Staphylococcus aureus and E. coli are key causes of infections. Most bacteria formed biofilms and showed resistance to many antibiotics, especially in biofilm form.
Area of Science:
- Medical Microbiology
- Infectious Diseases
- Antimicrobial Resistance
Background:
- Purulent-inflammatory processes are significant clinical challenges.
- Identifying etiological factors and microbial agents is crucial for effective treatment.
- The role of microbial biofilms in treatment failure is increasingly recognized.
Purpose of the Study:
- To assess etiological factors of purulent-inflammatory processes.
- To determine the antibiotic sensitivity of planktonic and biofilm microbial agents.
- To investigate the prevalence of specific bacterial pathogens in clinical samples.
Main Methods:
- Isolation and identification of clinical microbial strains from patient samples (wound tissue, pus, etc.).
- Assessment of bacterial biofilm formation using polystyrene flatbeds.
- Determination of microbial isolate sensitivity to various antibiotics via micro-test systems.
Main Results:
- Staphylococcus aureus (36.5%) and E. coli (17.3%) were leading causes of purulent-inflammatory processes.
- Other significant pathogens included Proteus spp. (14.6%), S. pyogenes (12.8%), P. aeruginosa (6.9%), and K. pneumoniae (6.7%).
- All isolates formed dense biofilms, and most exhibited polyresistance to antibiotics in biofilm form, contrasting with higher sensitivity in planktonic form to agents like Cefepime and Imipenem.
Conclusions:
- Bacterial biofilms significantly contribute to antibiotic resistance in purulent-inflammatory processes.
- The widespread and often ineffective use of antimicrobials drives the emergence of multidrug-resistant strains.
- Targeted antibiotic strategies considering planktonic and biofilm sensitivities are essential for managing these infections.
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07:46Use of Artificial Sputum Medium to Test Antibiotic Efficacy Against Pseudomonas aeruginosa in Conditions More Relevant to the Cystic Fibrosis Lung
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07:16Development of a Polymicrobial Colony Biofilm Model to Test Antimicrobials in Cystic Fibrosis
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