Emerging broad-spectrum resistance in Pseudomonas aeruginosa and Acinetobacter baumannii: Mechanisms and epidemiology

Area of Science:

• Microbiology
• Infectious Diseases
• Antimicrobial Resistance

Background:

• Non-fermenting Gram-negative rods, particularly Pseudomonas aeruginosa and Acinetobacter baumannii, are common nosocomial pathogens.
• These bacteria exhibit diverse resistance mechanisms, often leading to multidrug or pandrug resistance.

Purpose of the Study:

• To detail the primary resistance mechanisms in P. aeruginosa and A. baumannii.
• To review the global dissemination of these multidrug-resistant pathogens.

Main Methods:

• Literature review of resistance mechanisms.
• Analysis of global dissemination data for P. aeruginosa and A. baumannii.

Main Results:

• Key resistance mechanisms include extended-spectrum β-lactamases (ESBLs), carbapenemases, and 16S rRNA methylases.
• Co-resistance to fluoroquinolones, polymyxins, and tigecycline contributes to pandrug resistance.
• Recent worldwide dissemination patterns of these resistant strains are discussed.

Conclusions:

• Understanding resistance mechanisms and dissemination is crucial for combating P. aeruginosa and A. baumannii infections.
• Effective strategies are needed to manage the growing threat of multidrug and pandrug resistance in these critical pathogens.