Blind Spots in Healthcare-Associated C. diff Prevention

What’s still tripping us up? How IPs and EVS teams can close the gaps

C. difficile (“C. diff”) remains the most common healthcare-associated infection (HAI) and has been categorized as an urgent threat by the Centers for Disease Control and Prevention (CDC) since 2013.^1,2 This fact exploits vulnerabilities in our processes. Many facilities have made meaningful progress, with some achieving dramatic reductions over the last decade, yet breakthrough transmission still occurs despite the controls we think are solid.

That’s a signal worth taking seriously: Doing more of what we have already been doing may not be enough to drive the next step-change in reducing hospital-onset C. diff infections (HO-CDI).

So where are the blind spots? Themes that arise are often at the seam between infection prevention and control (IPC) and Environmental Services (EVS), and often in places our standard playbooks don’t emphasize. While this blog touches on several HO-CDI prevention strategies, it intentionally focuses more deeply on environmental cleaning and disinfection, an area where gaps are common and small missteps can result in transmission. Common blind spots in prevention will be highlighted, and practical, actionable ways to address each will be shared.

Evolving epidemiology

Over the past decade, the epidemiology of C. diff has shifted from dominance by a monoclonal epidemic strain (hypervirulent NAP1/BI/027) toward a more polyclonal mix of community-associated and non-NAP1 strains.³ These strains are affecting younger individuals without the traditional risk factors such as recent hospitalization.⁴

Community-associated CDI now accounts for nearly half of all C. diff cases in hospitals.⁵ This means, more patients arrive colonized. This reality challenges a strategy solely focused on interrupting in-hospital transmission from symptomatic cases.

Actions to consider:

• Because colonization goes unrecognized, lean into controls that do not rely on knowing colonization status such as rigorous hand hygiene, antimicrobial stewardship, and sporicidal environmental cleaning and disinfection for confirmed CDI cases.⁶

Delayed identification and isolation

C. difficile commonly presents as non-specific new-onset diarrhea, which delays clinical suspicion. Exposure often precedes confirmed diagnosis because during this early phase patients shed large numbers of spores, rapidly contaminating the care environment.7 The practice of initiating isolation precautions after three or more unexplained loose stools in a 24-hour period originates from the clinical criteria for testing.⁸

Actions to consider:

• Challenge the “gold standard” by initiating isolation precautions after the first unexplained loose stool while delaying testing until the 3rd unexplained loose stool in a 24-hour period.
• For confirmed CDI cases, do not perform a test for cure and continue isolation precautions for duration of stay.⁶

Communication failures

C. difficile prevention lives or dies at transitions: unit-to-unit, service-to-service, facility-to-facility.

When CDI status is not reliably communicated, appropriate IPC measures, including the use of a sporicidal disinfectant (e.g., bleach) are often overlooked.

Actions to consider:

• Ensure that nursing is accurately and timely documenting loose stools
• Use daily shift huddles to reinforce CDI prevention measures including the importance of hand washing with soap and water and disinfecting shared equipment and other items removed from the room with a sporicidal disinfectant.
• For transport within the facility, ensure that receiving departments know what “ready” looks like: appropriate personal protective equipment (PPE), hand hygiene, having bleach wipes ready at the point of use.
• For inter-facility transfers, use a standardized transfer form to communicate CDI status.

Cleaning and disinfection

C. difficile is uniquely suited for environmental transmission because the spores can survive on surfaces for prolonged periods and are not inactivated by many routine disinfectants such as quaternary ammonium compounds (“quats”). This durability allows the healthcare environment and equipment to function as a persistent reservoir for transmission if cleaning and disinfection are inadequate. C. diff transmission in healthcare facilities likely occurs from contaminated hands of healthcare workers, the care environment, or medical equipment.⁶ Multiple studies have demonstrated that patients admitted to rooms previously occupied by CDI patients have a significantly increased risk of acquiring C. diff themselves reinforcing the role of the healthcare environment as a reservoir for transmission.^9,10

Actions to consider:

• Use a sporicidal disinfectant for all post-discharge room cleaning. A 2019 study (Donskey et al) demonstrated a significant decrease in environmental contamination with C. diff spores in non-CDI decreased significantly from 26% to 5%. This practice provides the highest level of environmental cleaning (intermediate level) for all patients.¹¹
• In enhanced contact precaution rooms, replace non-sporicidal disinfecting wipes with sporicidal wipes.
• Transition from error-prone dilutable disinfectants to ready-to-use (RTU) sporicidal disinfectants. This has the added benefit of improving staff efficiency.
• C. difficile disinfection requires cleaning followed by disinfection. If a one-step EPA registered cleaner disinfectant with a C. diff claim is used, the same product can be used for both steps per the label.
• Consider all areas accessed by CDI patients, including Radiology and procedural spaces. Be sure these departments have sporicidal disinfecting wipes on hand.

Despite strong awareness and longstanding prevention efforts, C. difficile persists. As more patients arrive already colonized, prevention strategies must rely less on detection and more on robust, universal controls, including early isolation, clear handoffs, and disciplined use of sporicidal disinfection. By exploiting operational blind spots, particularly delayed identification, communication breakdowns, and inconsistent environmental cleaning, the gaps can be closed to further reduce healthcare-associated C. difficile infection rates.