Sept. 15, 2026

A new systematic review published in Infection Prevention in Practice delivers a sobering message to the environmental services and infection prevention community: despite decades of practice and a growing menu of disinfection technologies, there is still no solid randomized-trial evidence that any specific surface decontamination method actually reduces hospital-acquired infections (HAIs).

The review, conducted following rigorous Cochrane and GRADE methodology, searched the literature through March 2025 and screened more than 10,000 records. After a full-text review of 311 reports, the authors identified just 11 randomized or quasi-randomized controlled trials that met their eligibility criteria — trials conducted over four decades, from 1976 to 2024, mostly in large academic hospitals in the United States, Canada, and the UK.

A surprisingly small evidence base

Given how central environmental cleaning and disinfection are to infection prevention programs, the paucity of trial data is striking. Only seven of the eleven studies reported outcomes that could actually be analyzed for the review’s purposes — hospital-acquired infections, colonization, bloodstream infections, mortality, or adverse effects. Four studies, despite otherwise meeting inclusion criteria, didn’t report any outcome the reviewers could use.

The interventions studied ran the gamut of what EVS and IP professionals will recognize from their own facilities: quaternary ammonium compounds (QACs), bleach, phenolics, probiotic-based cleaners, improved hydrogen peroxide, ultramicrofiber cloths with copper biocides, no-touch UV-C and pulsed xenon UV devices, and copper-surfaced high-touch equipment. Comparators included detergents, standard practice, sham interventions, or no intervention at all.

What the numbers actually show

Across every single comparison — QAC versus detergent, probiotic versus detergent, phenolic versus detergent, UV-C versus standard practice, copper surfaces versus standard surfaces — the certainty of evidence was rated very low, with one partial exception. Effect estimates hovered close to “no difference,” but confidence intervals were wide enough to be compatible with meaningful benefit or, in some cases, meaningful harm. In plain terms: no comparison in this review reached a level of evidence that would let clinicians confidently say one method beats another for cutting HAIs.

The one comparison rated with moderate-certainty evidence — adding UV light to standard practice for vancomycin-resistant enterococci (VRE) colonization — suggested essentially no difference between the two approaches (incidence rate ratio: 1.00).

Copper surfaces produced numerically favorable point estimates for HAIs, bloodstream infections, and all-cause mortality in a single ICU trial, but the confidence intervals were wide and the certainty of evidence was rated very low, meaning the findings can’t be treated as confirmation that copper surfaces work.

Why the evidence is so weak

The reviewers point to several structural problems that have plagued this field for years:

• Bundled interventions. The most common reason full-text articles were excluded (accounting for 28 of the 256 exclusions) was the inability to separate the effect of surface decontamination from broader infection-control bundles that included hand hygiene campaigns, isolation precautions, and screening protocols.
  
• Underpowered studies. Most trials simply didn’t enroll enough patients to detect realistic differences in infection rates, which are already low in high-income-country hospitals thanks to other prevention measures.
  
• Financial conflicts of interest. Seven of the eleven included trials disclosed financial ties to product manufacturers.
  
• Surrogate outcomes. Much of the broader (non-RCT) literature on this topic measures surface contamination rather than actual patient infections — a proxy that doesn’t reliably predict clinical benefit.
  
• Unaddressed statistical issues. The reviewers identified unit-of-analysis errors in several trials, where cluster or crossover study designs weren’t properly accounted for in the original statistical analysis, and they had to reanalyze data to correct for this.

Not evidence of “no effect”

Importantly, the authors are careful to draw a distinction that’s easy to lose in a headline: inconclusive evidence is not the same as evidence that decontamination doesn’t work. “These inconclusive findings on cleaning or disinfection do not indicate evidence of no effect but highlight the need for new RCTs,” the review states. In other words, this is a call for better research, not a license to deprioritize environmental hygiene.

What this means for practice

For EVS and infection prevention leaders, the takeaway isn’t to abandon current protocols — it’s to recognize the limits of what the science can currently tell us about comparative effectiveness. The review’s authors call for:

• Adequately powered, multi-center, cluster-randomized trials focused on patient-relevant outcomes (not just surface contamination)
  
• Trials free of industry funding conflicts
  
• Research into conventional approaches like cleaning without disinfectants, alongside emerging technologies
  
• Development of a core outcome set and reporting standards specific to decontamination trials
  
• Greater use of genomic/molecular fingerprinting methods to trace transmission from environmental reservoirs to patients
  
• More research from low-resource and non-Western settings, where HAI burden is often higher

The review also notes four ongoing trials examining hydrogen peroxide vapor, copper surfaces, organosilane coatings, and engineered hospital rooms — suggesting the evidence base may grow in coming years.

Bottom line

This review doesn’t undermine the rationale for environmental hygiene programs, but it should temper confidence in specific product or technology claims. Until better-designed trials are completed, decisions about which disinfectant, device, or surface material to invest in will continue to rest more on cost, practicality, and biological plausibility than on high-certainty clinical trial evidence.

Aug. 20, 2026

A recent review in the American Journal of Infection Control examines whether continuous and enhanced daily disinfection technologies can outperform the basics — and finds that the fundamentals still carry the most weight.

Healthcare facilities have poured significant investment into technologies designed to keep environmental surfaces clean between the traditional cleaning windows — the moments when a room isn’t undergoing terminal disinfection but patient care, staff traffic, and visitor contact continue around the clock. A new review by Warren and Anderson, published in the September 2026 supplement of the American Journal of Infection Control, takes stock of where that investment stands, examining the evidence behind continuous and enhanced daily disinfection strategies aimed at reducing environmental contamination during active patient care.

Two Distinct Strategies, Two Different Pictures

The review draws a clear line between two categories of intervention that are often discussed together but behave quite differently in practice.

The first category — continuous disinfection technologies — includes light-based systems (such as continuous UV or antimicrobial lighting) and low-level chemical dispersal methods designed to provide ongoing antimicrobial activity throughout the day, without requiring a room to be taken out of service. These approaches have a strong track record in the lab: under controlled conditions, they demonstrate clear antimicrobial activity against a range of pathogens. But that laboratory performance hasn’t consistently translated into the real world. When deployed in actual clinical environments — with variable room occupancy, furniture and equipment placement, airflow, and human traffic — these technologies have shown inconsistent effectiveness. The gap between what a technology can do in a controlled chamber and what it accomplishes in a busy medical-surgical unit or ICU remains a persistent theme in environmental hygiene research, and this review adds to that body of caution.

The second category — enhanced daily disinfection strategies — fared somewhat better in the evidence base. This includes tools like electrostatic sprayers, which are designed to improve how thoroughly and evenly a disinfectant is applied to surfaces, and disinfectants formulated with residual activity, meaning they continue killing or suppressing microorganisms for a period after application rather than only at the moment of wiping. According to the review, these approaches improve disinfectant delivery and may reduce environmental bioburden — the overall microbial load present on a surface. Notably, residual disinfectants stood out as the more evidence-backed of the enhanced approaches: they have demonstrated sustained antimicrobial effects and reduced contamination in randomized clinical studies, giving them a firmer evidentiary footing than the continuous, no-touch technologies.

A Familiar Caveat: Bioburden Isn’t the Same as Fewer Infections

Even where the evidence looked more favorable, Warren and Anderson flag a limitation that will sound familiar to anyone following this literature closely: much of the supporting research relies on bioburden reduction as a proxy outcome, rather than directly measuring reductions in healthcare-associated infections. A product or technique can measurably reduce the microbial load on a countertop or bed rail without that translating into fewer infections in the patients who occupy the room — infection risk is shaped by many additional variables, including hand hygiene compliance, device management, and patient susceptibility.

Compounding this, the authors note that evidence across studies remains heterogeneous, and that randomized controlled trials specifically evaluating these enhanced and continuous strategies are still limited in number. That combination — proxy outcomes plus a thin base of high-quality trials — echoes the broader evidence gap that has repeatedly surfaced in systematic reviews of environmental decontamination.

The Bottom Line: Fundamentals First

Despite the appeal of newer disinfection technologies, Warren and Anderson’s conclusion lands on a pragmatic note: improving non-terminal disinfection may reduce contamination, but optimizing routine environmental cleaning practices remains the most effective and immediately actionable strategy.

For environmental services leaders, that’s a meaningful signal. It doesn’t dismiss the value of electrostatic sprayers, residual disinfectants, or continuous disinfection technology — but it does suggest that before facilities chase the next device or chemistry, the highest-yield investment is often the boring, unglamorous work of making sure routine cleaning is done consistently, correctly, and thoroughly, every time, on every shift. Technology can support and extend good cleaning practice; it doesn’t yet have the evidence to replace it.

What This Means in the Field

Taken together with other recent evidence reviews in this space, the message to EVS and infection prevention teams is converging: before adding new tools to the disinfection arsenal, facilities should first ensure that routine touchpoint cleaning, standardized product use, and staff competency validation are solid. New technologies may offer a valuable supplement — particularly residual disinfectants, which show the most promising trial data — but they are not yet a substitute for disciplined execution of the basics.

Reference: Warren BG and Anderson DJ. Continuous and enhanced daily disinfection strategies to reduce environmental contamination in healthcare settings. Am J Infect Control. 2026 Sep;54(9S):S101-S104. doi: 10.1016/j.ajic.2026.05.009. PMID: 42556924 DOI: 10.1016/j.ajic.2026.05.009