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[Four cases of respiratory tract infections caused by Corynebacterium pseudodiphtheriticum]
Y Yoshitomi1, Y Higashiyama, H Matsuda
1Second Department of Internal Medicine, Nagasaki University School of Medicine.
Abstract:
Four cases of respiratory tract infections caused by Corynebacterium pseudodiphtheriticum were reported. The first two patients developed pneumonia with Corynebacterium pseudodiphtheriticum during steroid therapy used against their underlying diseases. The other two patients had acute exacerbation of chronic pulmonary diseases caused by C. pseudodiphtheriticum. These four patients improved by antibiotic therapy. Though nondiphtheria corynebacteria are regarded as "normal flora" when they are isolated from sputum, they should be recognized as potential pathogens.
Insights
Corynebacterium pseudodiphtheriticum can cause respiratory infections like pneumonia, especially in immunocompromised patients. Prompt antibiotic treatment leads to recovery, highlighting its role as a potential pathogen beyond normal flora.
Area of Science:
- Medical Microbiology
- Infectious Diseases
- Pulmonology
Background:
- Nondiphtheria corynebacteria, including Corynebacterium pseudodiphtheriticum, are often considered commensal organisms or
- normal flora
- in respiratory samples.
- However, their pathogenic potential in specific clinical contexts remains under-recognized.
Observation:
- Four distinct cases of respiratory tract infections attributed to Corynebacterium pseudodiphtheriticum were documented.
- Two patients presented with pneumonia during immunosuppressive steroid therapy for underlying conditions.
- The remaining two cases involved acute exacerbations of pre-existing chronic pulmonary diseases.
Findings:
- All four patients demonstrated clinical improvement following targeted antibiotic therapy.
- Corynebacterium pseudodiphtheriticum was identified as the causative agent in these severe respiratory conditions.
- The bacterium's role extended beyond colonization to active infection.
Implications:
- These findings challenge the traditional view of Corynebacterium pseudodiphtheriticum as solely non-pathogenic.
- Clinicians should consider Corynebacterium pseudodiphtheriticum as a potential pathogen in respiratory infections, particularly in susceptible individuals.
- Recognition of this bacterium's pathogenic capacity is crucial for accurate diagnosis and effective treatment of respiratory diseases.