Cleansing nursing home residents' skin with antiseptic products and applying a nasal antiseptic reduced carriage of drug-resistant bacteria by 59 percent, while stepping up daily environmental cleaning of rooms produced no comparable reduction, according to a study published this week in JAMA Network Open.
The finding is a resource-allocation signal for long-term care facilities that cannot do everything at once. It is not a recommendation for families to buy antiseptic products or to attempt anything at home.
Drug-resistant organisms are endemic in nursing homes. Research summarized alongside the study notes that more than half of residents carry these organisms on their skin, usually without symptoms, and that carriage raises the risk of later infection, hospitalization, and death.
Two Strategies Tested Against Each Other
Researchers conducted a four-phase quality improvement study at two Southern California nursing homes, with data collected between March 2019 and April 2021. The phases ran sequentially: universal decolonization alone, routine care as a control, once-daily enhanced cleaning alone, and decolonization combined with enhanced cleaning.
Running the phases in sequence at the same facilities let investigators compare each approach against the same residents, staff, and building rather than against a different nursing home with different baseline practices. That design is a strength for comparison, though it also means seasonal changes and staffing shifts during the study period could influence results in ways the analysis cannot fully separate.
Investigators measured drug-resistant organisms on resident skin and in nostrils, along with contamination of high-touch objects in bedrooms and common areas. Swabs were processed for methicillin-resistant Staphylococcus aureus, vancomycin-resistant enterococci, extended-spectrum beta-lactamase producers and carbapenem-resistant Enterobacterales, all of which can live on a person without causing symptoms.
According to CIDRAP's summary of the findings, adjusted models showed decolonization alone was associated with a 59 percent reduction in carriage compared with the control phase and a 64 percent reduction compared with enhanced cleaning. Bedroom contamination fell 84 percent compared with control and 74 percent compared with enhanced cleaning.
Enhanced cleaning alone did not reduce carriage or bedroom contamination, and it added no measurable benefit for those outcomes when combined with decolonization. Common areas were the exception: there, where cleaning was performed after activities, decolonization and enhanced cleaning produced similar reductions in contamination, and the combination worked better than either alone.
Why the Result Is Not Intuitive
The instinct in infection control is that surfaces are the problem, an idea reinforced by years of pandemic messaging about disinfecting shared objects. This study points elsewhere for this particular category of organism, at least in resident bedrooms.
The proposed explanation is straightforward. If residents themselves carry the bacteria on their skin and in their nostrils, a freshly cleaned bed rail is recontaminated within hours by the same person who touched it before. Reducing the reservoir on the resident reduces what reaches the environment, which is consistent with the finding that bedroom contamination dropped most in the decolonization phases.
Decolonization in this study meant a specific chlorhexidine and nasal iodophor protocol: 2 percent leave-on chlorhexidine cloths for routine bed bathing, 4 percent rinse-off chlorhexidine liquid for showering, and twice-daily nasal povidone-iodine on a rotating weekday schedule, applied to all residents rather than only those known to carry an organism. It does not mean antibiotics, and it is not a treatment for an active infection.
Where the Evidence Stops
This limitation belongs up front. The study was a quality improvement project at two facilities, not a large randomized clinical trial, and it is published as an observational analysis of associations rather than proof of cause and effect.
The measured outcome was carriage and contamination, not infections, hospitalizations, or deaths. Earlier work on nursing home decolonization has linked the approach to reduced colonization and, in other studies, to fewer infections and hospitalizations, but this particular study did not measure those endpoints. An earlier presentation of the same CLEAN study reported a smaller carriage reduction than the final adjusted analysis.
Two facilities in one region also cannot represent the range of American nursing homes, which differ in staffing, resident acuity, building age and baseline infection control practice. The data collection period overlapped the first year of the COVID-19 pandemic, a period when cleaning practices and resident movement were unusual everywhere.
An accompanying JAMA Network Open commentary framed the work as an argument for hypothesis-driven research in nursing home infection prevention rather than as settled guidance. The authors themselves concluded that "only universal decolonization was associated with lower MDRO resident carriage" and bedroom object contamination.
Questions Families Can Ask a Facility
Families with a relative in a nursing home should not attempt decolonization themselves. Chlorhexidine and nasal antiseptics used incorrectly can cause skin reactions and allergic responses, and universal use is a facility-level clinical decision made under medical direction.
What families can reasonably do is ask questions during a care conference. Useful ones include whether the facility uses chlorhexidine bathing, whether it screens for drug-resistant organisms, how it handles residents returning from hospital stays, and what its infection prevention staffing looks like. Facilities are accustomed to these questions.
Residents at highest risk are those with indwelling devices such as urinary catheters, feeding tubes or central lines, those with open wounds or pressure injuries, people recently discharged from an intensive care unit or long-term acute care hospital, and anyone with repeated antibiotic exposure.
Signs that should prompt a call to the facility's clinical staff include fever, new confusion, redness or drainage at a wound or device site, or a sudden decline in alertness. Colonization alone causes no symptoms and does not require antibiotic treatment, which is why testing without a clinical reason is not recommended.
Larger randomized trials would be needed to confirm these results across diverse facilities and to measure whether the approach reduces infections and hospitalizations at scale. MedicalDaily will report further research and any changes to federal long-term care infection control guidance.
The bottom line: the newest finding is that decolonizing residents outperformed extra room cleaning for reducing superbug carriage in two nursing homes, the people most affected are residents with devices, wounds, or recent hospital stays, and the evidence is preliminary rather than definitive.
Frequently Asked Questions
What did the study find? Universal decolonization of nursing home residents was associated with a 59 percent reduction in drug-resistant organism carriage compared with routine care, while enhanced daily cleaning alone showed no comparable reduction.
What is decolonization? Routine chlorhexidine bathing combined with a nasal antiseptic, applied to all residents rather than only known carriers. It does not involve antibiotics.
Does this mean cleaning does not matter? No. In common areas, enhanced cleaning reduced contamination and worked best combined with decolonization. Environmental cleaning also remains essential for other pathogens and for basic hygiene.
How strong is the evidence? It is preliminary. This was a two-facility quality improvement study showing associations, not a large randomized clinical trial, and it measured carriage rather than infections or deaths.
Should families try this at home? No. Antiseptic products used incorrectly can cause skin reactions and allergic responses. Decolonization is a facility-level clinical decision.
Which residents face the highest risk? Those with urinary catheters, feeding tubes or central lines, open wounds or pressure injuries, recent intensive care or long-term acute care stays, and repeated antibiotic exposure.
What should families ask a nursing home? Whether the facility uses chlorhexidine bathing, whether it screens for drug-resistant organisms, how it manages residents returning from hospitals, and how infection prevention is staffed.
