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Candida auris is an emerging, multi-drug resistant fungi that is highly transmissible. The name, “auris” is derived from the Latin word for ear, because this was the first body site in which the fungi was identified.1 As with other Candida species, C. auris colonizes the skin, mucous membranes, gastrointestinal tract and the female genital tract. Five to ten percent of susceptible patients develop invasive infections, such as bloodstream infections, with high mortality rates. Infections caused by this organism have been tracked carefully and, until recently, were thought to occur due to exposure to antifungal drugs rather than via person-to-person transmission. However, in July 2021, The Centers for Disease Control and Prevention (CDC) released a report confirming transmission from patient-to-patient.2
In the wake of this new understanding that C. auris can be transmitted from person-to-person, the Association for Professionals in Infection Control and Epidemiology (APIC) released a statement urging healthcare facilities to adopt aggressive infection prevention and control measures to stop the spread of C. auris in healthcare settings.3 The most important prevention and control measures, as described by the CDC and reinforced by APIC, include:4
As we have seen with other pathogens of concern such as C. difficile, these guidelines reinforce the critical role that the environment plays in the transmission of C. auris. Studies have determined that this organism can survive on moist and dry surfaces for up to one month.3,5 Even more challenging, there is evidence that it can survive in both wet and dry biofilms, making it harder to eradicate from the environment once it has been introduced.6.
In 2020, the CDC created Core Components for Environmental Cleaning and Disinfection in Hospitals.7 These core components outline an effective environmental hygiene program and are more important than ever when faced with an emerging pathogen such as C. auris. Let’s look at these Core Components and how relate to management of C. auris:
Integrate EVS into the hospital safety culture.
Providing a clean patient environment is a cornerstone of a hospital’s safety culture. To prevent transmission of C. auris, frequent communication and collaboration between departments is critical. When patients are diagnosed or admitted with C. auris, the Environmental Services department must be promptly notified so that C. auris protocols can be activated.
Educate and Train.
When novel pathogens such as C. auris arise, all staff must be educated on the organism, its transmission, transmission-based precautions needed, and specific practices and products that must be incorporated to prevent transmission. Reinforce concepts with ongoing education with new healthcare personnel and as new guidance becomes available.
Select products that are effective against the organisms of concern.
There have been several studies that evaluate the efficacy of disinfectants against C. auris.8 The Environmental Protection Agency (EPA) maintains List P, which includes all EPA-registered antimicrobial products with claims against Candida auris, along with their contact times.9 Among the active ingredients that are effective are hydrogen peroxide/peracetic acid, dodecylbenzenesulfonic acid (DDBSA), hydrogen peroxide and sodium hypochlorite. If products on List P are not accessible or are otherwise unsuitable, interim CDC guidance permits the use of an EPA-registered, hospital- grade disinfectant that is effective against C. difficile. Quaternary ammonium compounds (QACs) are widely used as disinfectants in healthcare. However, data from recently published studies indicates that products whose only active ingredient is QAC are not effective against C. auris.4,10 Regardless of the product selected, it is important to read label claims and follow all manufacturer’s instructions for use, including applying the product for the correct contact time.
No-touch technologies such as vaporized hydrogen peroxide or germicidal UV irradiation are increasingly integrated into terminal cleaning processes.11 While there is limited research about the efficacy of these technologies specifically against C. auris, they may be an adjunct to routine cleaning and disinfection processes. Decontamination with 35% hydrogen peroxide vapor was deployed as part of a range of measures to successfully control a C. auris outbreak in a European hospital.12 In laboratory testing, Candida auris and two other Candida species were significantly less susceptible to killing by UV-C than MRSA.13
The CDC C. auris guidelines recommend meticulous attention to daily and terminal cleaning/disinfection of all patient rooms, all areas where they receive care, and all shared equipment. C. auris has been cultured from many locations in patient rooms, including high touch surfaces and general environmental surfaces such as windowsills. Shared equipment such as glucometers, blood pressure cuffs and nursing carts have also been found to be contaminated with C. auris.4
Monitor Adherence and Provide Feedback.
Disinfectants are only effective when consistently and correctly applied. Objective monitoring and feedback on the thoroughness of cleaning using objective methods such as fluorescent markers are essential to ensure that critical surfaces and equipment have been disinfected. The CDC C. auris guidelines recommend increased environmental hygiene monitoring when there is a patient with known/suspected C. auris in the facility.4 Environmental hygiene monitoring data must be shared with staff and leadership to drive continuous improvement. For more information on evaluating environmental cleaning, review the CDC Toolkit: Options for Evaluating Environmental Cleaning.14
We now understand that Candida auris, a very dangerous emerging pathogen, can be transmitted easily from patient-to-patient, with the healthcare environment as a key vector. Once again, environmental hygiene plays a central role in preventing transmission of this emerging infection. The CDC has published recommendations for infection prevention for Candida auris, including the use of disinfectants that are effective against C. auris and increased environmental hygiene monitoring to ensure cleanliness. These pathogen-specific recommendations dovetail into previously published Core Components of Environmental Cleaning and Disinfection in Hospitals.
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