[Clinically isolated bacterii seen in complicated infections]

Area of Science:

• Surgical Site Infections
• Microbiology
• Infectious Diseases

Background:

• The bacterial landscape of post-operative infections has shifted over time.
• Advances in bacterial detection and antibiotic use may influence these changes.
• Nosocomial infections, particularly those caused by Methicillin-resistant Staphylococcus aureus (MRSA), remain a critical concern.

Purpose of the Study:

• To analyze the changing spectrum of bacterial pathogens in post-operative infections.
• To identify key bacterial agents that require heightened clinical attention due to pathogenicity, prevalence, and drug resistance.
• To discuss the implications of antibiotic resistance in common post-operative pathogens.

Main Methods:

• Review of common bacterial isolates from post-operative infections.
• Assessment of pathogenicity, isolation frequency, and antimicrobial resistance patterns.
• Analysis of antibiotic efficacy against specific resistant strains, including MRSA, Pseudomonas aeruginosa, and beta-lactamase-producing Bacteroides spp.

Main Results:

• Staphylococcus spp., E. faecalis, E. coli, Klebsiella spp., E. cloacae, P. aeruginosa, and Bacteroides spp. are common isolates.
• MRSA, P. aeruginosa, and Bacteroides spp. are identified as agents requiring the most caution.
• MRSA shows high prevalence, with vancomycin as the primary effective antibiotic.
• P. aeruginosa exhibits resistance to many cephem antibiotics.
• Approximately 50% of Bacteroides spp. produce beta-lactamase, deactivating penicillin and cephem drugs.

Conclusions:

• The evolving nature of post-operative infections necessitates continuous monitoring of causative agents.
• Antibiotic resistance in key pathogens like MRSA, P. aeruginosa, and Bacteroides spp. presents significant treatment challenges.
• Mixed infections involving these resistant bacteria require careful consideration of antibiotic stability and efficacy.