Case-control study comparing de novo and daptomycin-exposed daptomycin-nonsusceptible Enterococcus infections

Area of Science:

• Infectious Diseases
• Antimicrobial Resistance
• Clinical Microbiology

Background:

• Daptomycin is a critical antibiotic for treating resistant Gram-positive infections.
• Emergence of daptomycin nonsusceptibility in Enterococcus poses a significant clinical challenge.
• Understanding de novo daptomycin-nonsusceptible Enterococcus (DNSE) is crucial for treatment strategies.

Purpose of the Study:

• To identify factors associated with de novo daptomycin-nonsusceptible Enterococcus (DNSE) infections.
• To compare characteristics of patients with DNSE who were daptomycin treatment-naïve versus those with prior daptomycin exposure.

Main Methods:

• A case-control study was conducted.
• Patients with DNSE infections were divided into two groups: daptomycin treatment-naïve (n=9) and prior daptomycin exposure (n=13).
• Clinical data and prior antimicrobial exposures were compared between groups.

Main Results:

• De novo DNSE infections were associated with less frequent prior antimicrobial exposure.
• Increased susceptibility to nitrofurantoin and gentamicin was observed in the de novo DNSE group.
• Shorter duration of hospitalization was linked to de novo DNSE infection.

Conclusions:

• Findings suggest a potential community reservoir for de novo daptomycin-nonsusceptible Enterococcus.
• Reduced prior antibiotic exposure may be a marker for community-acquired DNSE.
• Further research is needed to elucidate community acquisition mechanisms.