Abstract
ABSTRACTEnterococci are ancient commensal bacteria that recently emerged as leading causes of antibiotic-resistant, hospital-acquired infection. Vancomycin-resistant enterococci (VRE) epitomize why drug-resistant enterococcal infections are a problem: VRE readily colonize the antibiotic-perturbed gastrointestinal (GI) tract where they amplify to large numbers, and from there, they infect other body sites, including the bloodstream, urinary tract, and surgical wounds. VRE are resistant to many antimicrobials and host defenses, which facilitates establishment at the site of infection and confounds therapeutic clearance. Having evolved to colonize the GI tract, VRE are comparatively ill adapted to the human bloodstream. A recent study by Honsa and colleagues (E. S. Honsa et al., mBio 8:e02124-16, 2017, https://doi.org/10.1128/mBio.02124-16) found that a strain of vancomycin-resistant Enterococcus faecium evolved antibiotic tolerance within the bloodstream of an immunocompromised host by activating the stringent response through mutation of relA. Precisely how VRE colonize and infect and the selective pressures that led to the outgrowth of relA mutants are the subjects of ongoing research.
Highlights
Enterococci are ancient commensal bacteria that recently emerged as leading causes of antibiotic-resistant, hospital-acquired infection
The study by Honsa and colleagues [3] describes the evolution of a vancomycin-resistant E. faecium strain within such a patient. How did this pediatric patient become infected with Vancomycin-resistant enterococci (VRE)? most VRE infections begin with colonization of the GI tract by bacteria that are ingested from the hospital environment (Fig. 1)
6 weeks old, she had an immature GI tract microbiome, which was further confounded by chemotherapy to treat acute myeloid leukemia, causing impaired host defenses, accompanied by antibiotic treatment
Summary
Enterococci are ancient commensal bacteria that recently emerged as leading causes of antibiotic-resistant, hospital-acquired infection. Vancomycin-resistant enterococci (VRE) pose a special threat to immunocompromised patients, who often undergo antibiotic treatment or prophylaxis in hospitals. The study by Honsa and colleagues [3] describes the evolution of a vancomycin-resistant E. faecium strain within such a patient.
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