New national surveillance data released recently by the Centers for Disease Control and Prevention (CDC) confirms what infection preventionists have been cautiously optimistic about for years: hospital-acquired infections in the U.S. are trending downward. But a closer read of the data — and of what it does not measure — points squarely at the unfinished business of environmental hygiene.

The Headline Numbers

According to the CDC’s Emerging Infections Program (EIP) point-prevalence survey, conducted across 218 hospitals in 10 states and encompassing 13,653 patients, roughly 1 in 38 hospitalized patients had at least one healthcare-associated infection (HAI) on any given day in 2023, down from 1 in 31 in 2015. After statistical adjustment for differences in the patient populations captured by each survey, researchers calculated that patients in 2023 were 27 percent less likely to have an HAI than patients in 2015 — a risk ratio of 0.73 in the 151 hospitals that participated in both survey cycles.

The findings, led by CDC epidemiologist Nora Chea, MD, and colleagues, were published July 15, 2026, in the New England Journal of Medicine, alongside a companion CDC press release and the 2023 NHSN Progress Report.

“CDC and CMS together are reducing healthcare-associated infections, a leading cause of mortality in America,” said acting CDC director Jay Bhattacharya, MD, PhD, in the agency’s announcement. “When federal agencies collaborate with specific goals and accountability, including use of quality measures, patients benefit from better care in clinical settings.”

Despite the improvement, the absolute burden remains substantial: an estimated 518,000 HAIs occurred in U.S. hospitals in 2023, affecting roughly 471,000 patients and costing the healthcare system billions of dollars annually.

Where the Gains Came From

The prevalence survey’s device- and procedure-associated categories showed the clearest movement. Comparing 2023 acute-care data to prior years, the NHSN Progress Report and the NEJM analysis point to meaningful reductions in several device-associated infection types: central line-associated bloodstream infections fell from a prevalence of roughly 0.30 percent to 0.16 percent, and catheter-associated urinary tract infections dropped from about 0.20 percent to 0.09 percent.

The single largest contributor to the overall decline, however, was Clostridioides difficile. CDI prevalence fell by more than half, from 0.54 percent in 2015 to 0.22 percent in 2023. Dr. Chea told Healio that the drop likely reflects a combination of factors: wider adoption of two-step testing protocols, changes to NHSN reporting definitions, more selective diagnostic testing, and genuine improvements in antimicrobial stewardship and infection prevention and control practice.

That last category — IPC practice — is where environmental services intersects directly with the data, whether or not the CDC’s framing makes that connection explicit. C. diff is a spore-forming organism that survives for extended periods on hospital surfaces and is transmitted primarily through environmental and hand contact routes rather than through devices. A halving of its prevalence over an eight-year span is difficult to explain through clinical intervention alone; it is, at minimum, consistent with improvements in terminal cleaning protocols, UV and other adjunct disinfection technologies, and tightened environmental hygiene compliance monitoring across that same period — none of which appear as a named variable in the CDC’s public accounting.

Where the Numbers Didn’t Move

Not every category improved. Surgical site infections and pneumonia — two of the three most common HAI types identified in the survey — showed little to no change between 2015 and 2023, and some reporting on the underlying NHSN data indicates non-ventilator-associated pneumonia prevalence actually held roughly flat, moving from about 0.58 percent to 0.49 percent, a smaller shift than the device-associated categories saw.

Perhaps the most striking figure in the entire dataset, and the one most relevant to an EVS and environmental hygiene readership, is this: 61 percent of all HAIs identified in the 2023 survey were not associated with any medical device or procedure at all. Pneumonia, surgical site infections, and gastrointestinal infections — the three most common HAI categories — are overwhelmingly non-device-associated. That distinction matters enormously for prevention strategy. Device-associated infection bundles have a two-decade head start in national attention, standardized protocols, and NHSN benchmarking infrastructure. Non-device-associated infection, where the built environment, surface contamination, air handling, and cleaning and disinfection practice play a much larger causal role, has no equivalent standardized national reporting category — and, not coincidentally, is exactly where the survey shows the least improvement.

The Caveat CDC Itself Flagged

The survey excluded COVID-19 from its HAI accounting entirely. Dr. Chea acknowledged to Healio that while the study wasn’t designed to assess pandemic-era effects, a substantial body of separate research has already shown that the COVID-19 pandemic drove measurable increases in several HAI categories during the years the survey doesn’t directly capture. That gap is worth noting for anyone using this data to argue that infection prevention gains are now secure; the 2015-to-2023 window brackets, rather than isolates, the pandemic’s disruptive effect on IPC and EVS staffing, protocol adherence, and environmental cleaning capacity.

What CMS Sees in the Numbers

CMS Administrator Dr. Mehmet Oz framed the results as validation of the agency’s oversight posture. “The drop in healthcare-associated infections shows that accountability and transparency are driving results,” Oz said in the CDC’s release. “CMS is leveraging every oversight tool to hold providers to the highest standards of safety while working to lower unnecessary costs. Progress so far is promising, but preventable harm across our healthcare system must continue to decline.”

Shelley Magill, MD, PhD, acting deputy director for science and program at CDC’s Division of Healthcare Quality Promotion, struck a similar balance between credit and caution: “This is good news for patient safety and healthcare quality — we’re thankful for the public health and healthcare partners that helped drive this progress. We are committed to working with partners to prioritize patient safety and invest in innovative strategies to further reduce healthcare-associated infections and protect the health of all Americans.”

The Takeaway for Environmental Hygiene Programs

Read plainly, the 2023 survey tells a genuinely encouraging story about device-associated infection prevention. Read more carefully, it also draws a fairly precise map of where the next decade of HAI reduction work has to happen: in the 61 percent of infections that have no device or procedure attached to them, and in the surgical-site and pneumonia categories that a near-decade of national quality-improvement infrastructure has so far failed to move. Those are not primarily antimicrobial stewardship problems or device-bundle compliance problems. They are, in significant part, environmental hygiene problems — and the data CDC just published is a reasonably strong argument, whether the agency frames it that way or not, for treating environmental services as a measured, credentialed, and monitored clinical discipline rather than a background operational function.

Summary is AI-assisted based on the following references:

CDC press release, July 15, 2026; Chea N, et al., “Health Care-Associated Infections in U.S. Hospitals, 2023 versus 2015,” New England Journal of Medicine, July 16, 2026 (DOI: 10.1056/NEJMoa2510881)

2023 NHSN Progress Report.

American Hospital Association news summary, July 17, 2026.

Healio infectious disease coverage, July 16, 2026.