Infections caused by Pseudomonas maltophilia. Expanding clinical spectrum

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.