VRE Persists in ICU Environments Despite Intensive Cleaning Interventions
Key Takeaway
Even after intensive retraining raised cleaning compliance from 49% to 85%, VRE contamination in ICU environments only declined modestly. Biofilm-protected organisms in drains and hard-to-reach surfaces resist standard disinfection. Prevention-based controls that do not depend on human compliance are essential.
The Study
Researchers at Rush University Medical Center conducted a sequential intervention trial in medical intensive care units to determine why vancomycin-resistant Enterococcus (VRE) contaminated ICU surfaces despite cleaning protocols. They tested whether the problem was the cleaning product, the procedure, or personnel compliance. Through classroom education, real-time observational monitoring, and intensified supervision, they improved housekeeping cleaning compliance from 49% to 85% of environmental sites. Despite this significant improvement, VRE contamination remained, declining only modestly from 13% to 8% on post-cleaned surfaces.
Key Findings
Compliance improved but contamination persisted
Cleaning compliance rose from 49% to 85% after intensive retraining, but VRE contamination dropped only from 13% to 8% on post-cleaned surfaces. Better cleaning alone was not enough.
Personnel performance was the primary gap
The study identified personnel failure to reach or adequately clean all surfaces as the core problem, rather than inadequate cleaning agents or faulty written procedures.
Biofilm-protected organisms resist disinfection
The persistence of VRE despite improved cleaning suggests that organisms in drains and crevices form biofilms resistant to standard disinfection, sheltering pathogens from chemical exposure.
Sustained supervision required
Even limited improvements required ongoing supervision and monitoring, creating significant operational burden with incomplete results.
What This Means For Your Facility
This study demonstrates a fundamental limitation of cleaning-based infection control: even with the best training and supervision, standard protocols cannot reliably eliminate VRE from complex environments like drain systems. Drain P-traps, with their internal geometry and biofilm-supporting conditions, are among the most difficult sites to disinfect from the outside.
Green Drain is a supportive, passive engineering control that complements, not replaces, infection prevention. It is a waterless one-way valve that allows water to drain but restricts the retrograde movement of air and aerosols from the drainage system into the occupied space. It removes the standing water a conventional trap relies on, and it does not remediate an existing biofilm. A single drop-in installation adds this control without staff compliance requirements, retraining cycles, or recurring labor costs.
Full Citation
Related Research
Stop Relying on Cleaning Alone
Green Drain's waterless one-way valve restricts the retrograde movement of air and aerosols from the drainage system, working independently of staff compliance. Drop-in installation, lasting performance.