Vancomycin-resistant streptococci or Leuconostoc sp

Area of Science:

• Microbiology
• Clinical Infectious Diseases
• Antimicrobial Resistance

Background:

• Vancomycin is a critical antibiotic for treating serious gram-positive bacterial infections.
• Emergence of vancomycin resistance in bacteria poses a significant threat to public health.
• Leuconostoc species are typically found in food products and rarely associated with human infections.

Observation:

• Two clinical isolates of Leuconostoc spp. demonstrated exceptionally high vancomycin resistance (MICs of 512 and 1,024 µg/mL).
• These gram-positive cocci were recovered from blood cultures of immunocompromised patients.
• This marks the first reported isolation of Leuconostoc spp. from human clinical specimens.

Findings:

• Antimicrobial susceptibility testing was performed on eight Leuconostoc strains, including the two clinical isolates.
• The study evaluated the efficacy of 23 different antimicrobial agents against these resistant Leuconostoc strains.
• Detailed susceptibility profiles will guide treatment strategies for infections caused by these organisms.

Implications:

• The findings highlight Leuconostoc spp. as a potential source of emerging vancomycin resistance in clinical settings.
• Understanding the antimicrobial susceptibility patterns is crucial for managing infections caused by these unusual pathogens.
• This research underscores the need for vigilance in monitoring for non-traditional bacteria exhibiting high-level antibiotic resistance.