Resistance in gram-negative bacteria: Enterobacteriaceae

Area of Science:

• Microbiology
• Infectious Diseases
• Antimicrobial Resistance

Background:

• Enterobacteriaceae infections are increasingly difficult to treat due to rising antimicrobial resistance.
• Significant proportions of Klebsiella pneumoniae and Enterobacter spp. infections in US ICUs are resistant to third-generation cephalosporins.
• Resistance mechanisms include extended-spectrum beta-lactamases (ESBLs) and AmpC beta-lactamases, often plasmid-mediated and co-occurring with multidrug resistance.

Purpose of the Study:

• To review the current landscape of resistance in Enterobacteriaceae.
• To highlight the clinical implications of resistance, including treatment challenges and emerging resistance patterns.
• To emphasize the need for enhanced infection control and antibiotic stewardship.

Main Methods:

• Literature review of antimicrobial resistance trends in Enterobacteriaceae.
• Analysis of resistance mechanisms, including ESBLs, AmpC beta-lactamases, and quinolone resistance.
• Discussion of current therapeutic options and emerging resistance threats like carbapenemases.

Main Results:

• Third-generation cephalosporin resistance is common in K. pneumoniae and Enterobacter spp. due to ESBLs and AmpC overproduction.
• ESBL-producing strains, including E. coli and Salmonella, are prevalent in healthcare and community settings.
• Carbapenems are generally effective, but carbapenem resistance, particularly KPC-type carbapenemases, is an increasing concern.

Conclusions:

• The spread of resistance in Enterobacteriaceae poses a significant global health threat.
• Effective treatment relies on carbapenems, but their utility is challenged by emerging resistance.
• Urgent implementation of antibiotic stewardship and infection control measures is critical to curb further resistance spread.