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Infections caused by Pseudomonas maltophilia. Expanding clinical spectrum
Abstract:
Pseudomonas maltophilia (Xanthomonas maltophilia) is a frequently isolated commensal that is gaining increasing recognition as an opportunistic pathogen in debilitated hosts. We report three unusual infections due to P maltophilia that illustrate the ability of the organism to cause life-threatening illness. We describe a case of postoperative meningitis, a case of recurrent bacteremia complicated by ecthyma gangrenosum, and a case of native valve endocarditis in a drug addict. Because of frequent isolation from noninfected sites, the pathogenic potential of P maltophilia may be overlooked. The notable resistance of this organism is commonly used beta-lactam and aminoglycoside antibiotics may complicate therapy.
Insights
Pseudomonas maltophilia, often a harmless commensal, can cause severe, life-threatening infections in vulnerable patients. This opportunistic pathogen exhibits resistance to common antibiotics, complicating treatment strategies.
Area of Science:
- Medical Microbiology
- Infectious Diseases
- Clinical Pathology
Background:
- Pseudomonas maltophilia (now known as Xanthomonas maltophilia) is commonly isolated from various sources.
- It is increasingly recognized as an opportunistic pathogen, particularly in immunocompromised or debilitated individuals.
- Understanding its pathogenic potential is crucial for effective clinical management.
Observation:
- This report details three distinct and severe infections caused by P. maltophilia.
- Cases include postoperative meningitis, recurrent bacteremia with ecthyma gangrenosum, and native valve endocarditis in an intravenous drug user.
- These cases highlight the organism's capacity to cause critical illness.
Findings:
- P. maltophilia can manifest as severe infections, challenging clinical assumptions based on its commensal status.
- The organism demonstrated significant resistance to commonly prescribed beta-lactam and aminoglycoside antibiotics.
- Clinical presentations varied, underscoring the diverse spectrum of P. maltophilia-associated diseases.
Implications:
- The pathogenic potential of P. maltophilia may be underestimated due to its frequent isolation from non-pathogenic sites.
- Antimicrobial resistance patterns necessitate careful selection of therapeutic agents.
- Clinicians should maintain a high index of suspicion for P. maltophilia in severe infections, especially in at-risk populations.