Comparative genome analysis of multiple vancomycin-resistant Enterococcus faecium isolated from two fatal cases.

Area of Science:

• Microbiology
• Genomics
• Infectious Diseases

Background:

• Enterococcus faecium is a common gut bacterium and a significant opportunistic pathogen.
• Rising rates of enterococcal infections are linked to antibiotic resistance, particularly to vancomycin.
• Vancomycin-resistant Enterococcus faecium (VREfm) poses a major healthcare challenge.

Observation:

• Comparative genome analysis was performed on four VREfm strains from two fatal cases in Malaysia.
• Two sequence types, ST80 and ST203, belonging to clonal complex 17, were identified.
• Strain VREr5 showed greater genomic similarity to a strain from a different patient, suggesting potential cross-contamination or shared origin.

Findings:

• The study identified ST80 strains in Malaysia for the first time.
• Patient Y was likely infected by multiple VREfm clones, possibly originating from the same clone as patient X's infection.
• The VREfm strains possessed virulence genes (epa locus, pilus-associated genes) and a potential biofilm-forming gene (bee locus homolog).

Implications:

• Genomic insights into VREfm transmission dynamics and clonal relatedness are crucial for infection control.
• Understanding virulence factors can guide the development of targeted therapies against VREfm.
• This research underscores the importance of genomic surveillance for tracking multidrug-resistant organisms in clinical settings.