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Correlations between Microbiological Outcomes and Clinical Responses in Patients with Severe Pneumonia
Sungmin Kiem1, Jerome J Schentag2
1Department of Internal Medicine, Inje University College of Medicine, Busan, Korea.
Background:
In treatment of pneumonia, microorganisms sometimes persist, appear or reappear despite good clinical responses. On the other hand, recent increasing antibiotic resistance emphases the goal of rapid eradication of pathogen in severe infection. This study was planned to evaluate the correlations between microbiological outcomes and clinical responses in severe pneumonia.
Materials And Methods:
Data was gathered from 3 clinical trials regarding severe pneumonia. Microbiological outcomes, determined by serial culture of respiratory tract samples,were compared with clinical outcomes.
Results:
In total, 146 bacterial strains from 76 patients were analyzed. While clinical success was generally related to total or partial eradication of isolated organisms, Acinetobacter, Enterobacter, Pseudomonas aeruginosa, and Stenotrophomonas maltophilia were often not eradicated and yet were observed in 56% of cases considered clinically successful at the end of antibiotic treatment. Most of the non-eradicated strains (71%) already had or developed resistance against the antibiotics used for treatment. Ten patients relapsed during the follow-up period; 7 of these relapses were associated with 10 non-eradicated organisms.
Conclusions:
These data raise concern about the pathogenicity of bacteria that persist in the respiratory tract even though good clinical outcomes of pneumonia are achieved, especially when Acinetobacter, Enterobacter, P. aeruginosa, or S. maltophilia were involved. Thus, clinical relapse and development of drug resistance by non-eradicated organisms may be raised.
Insights
Persistent bacteria in severe pneumonia can lead to relapse and antibiotic resistance, even with good clinical responses. Eradication of specific pathogens like Pseudomonas aeruginosa is crucial for long-term outcomes.
Area of Science:
- Medical Microbiology
- Infectious Diseases
- Clinical Medicine
Background:
- Microbial persistence, emergence, or reappearance can occur in pneumonia despite clinical improvement.
- Rising antibiotic resistance necessitates rapid pathogen eradication in severe infections.
- Understanding the link between microbiological and clinical outcomes in severe pneumonia is critical.
Purpose of the Study:
- To evaluate the correlation between microbiological outcomes and clinical responses in patients with severe pneumonia.
- To investigate the significance of persistent microorganisms in severe pneumonia treatment.
- To assess the impact of specific bacterial species on treatment success and relapse.
Main Methods:
- Analysis of data from three clinical trials focused on severe pneumonia.
- Comparison of microbiological outcomes (via serial respiratory tract sample cultures) with clinical outcomes.
- Identification and characterization of bacterial strains and their antibiotic susceptibility.
Main Results:
- 146 bacterial strains from 76 patients were analyzed.
- Clinical success was often observed despite the persistence of organisms like Acinetobacter, Enterobacter, Pseudomonas aeruginosa, and Stenotrophomonas maltophilia (56% of cases).
- Most non-eradicated strains (71%) exhibited or developed antibiotic resistance, and 7 out of 10 relapses were linked to non-eradicated organisms.
Conclusions:
- Persistent bacteria in severe pneumonia raise concerns about pathogenicity, particularly Acinetobacter, Enterobacter, P. aeruginosa, and S. maltophilia.
- Non-eradicated organisms may contribute to clinical relapse and the development of antimicrobial resistance.
- Clinical success alone may not fully represent treatment efficacy, highlighting the importance of microbiological clearance.
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