Epidemiology of β-Lactamase-Producing Pathogens

Area of Science:

• Microbiology
• Infectious Diseases
• Antimicrobial Resistance

Background:

• β-Lactam antibiotics have been used for 70 years, leading to the evolution of β-lactamase enzymes.
• β-lactamases are crucial in Gram-negative bacteria, conferring resistance to a wide range of β-lactam antibiotics.
• Genes encoding critical β-lactamases are often on mobile genetic elements, facilitating interspecies transfer.

Purpose of the Study:

• To review the significance of β-lactamase enzymes in antibiotic resistance.
• To highlight major β-lactamase families and their global prevalence.
• To emphasize the growing threat of multidrug-resistant organisms due to β-lactamase production.

Main Methods:

• Literature review of β-lactamase research.
• Analysis of geographic distribution of key β-lactamase variants.
• Synthesis of information on the clinical impact and spread of β-lactamase-producing bacteria.

Main Results:

• Major β-lactamase families include extended-spectrum β-lactamases (ESBLs), AmpC cephalosporinases, and carbapenemases.
• CTX-M enzymes are the most common ESBLs globally.
• Carbapenemases like KPC and NDM show distinct geographic prevalence.
• Co-occurrence of multiple β-lactamase genes in single organisms is increasing.

Conclusions:

• The continuous selective pressure from β-lactam use drives the emergence and spread of β-lactamase-producing pathogens.
• Multidrug resistance mediated by β-lactamases poses a significant threat in healthcare and community settings.
• Enhanced infection control and antimicrobial stewardship are essential to combat the rise of these pathogens.