Candida auris spreads primarily through direct contact with colonized patients and indirect contact with contaminated surfaces and medical equipment in healthcare settings. Unlike most fungal infections, it does not spread through the air. The organism is remarkably persistent in hospital environments, which is why outbreaks tend to concentrate in facilities where patients share equipment and receive hands-on care. In 2024, the CDC reported 6,304 clinical cases in the United States, a number that has climbed steadily since the fungus was first detected in 2016.
Person-to-Person Contact
The most direct route of transmission is skin-to-skin contact with someone carrying the fungus. Many people who harbor C. auris have no symptoms at all. Healthcare providers call this “colonization,” and it is far more common than active infection. The fungus favors warm, moist areas of the body, particularly the armpits and groin, but it has been found on dozens of body sites including the nose, throat, wounds, and ears.
What makes colonization so significant is that it tends to last a long time. C. auris typically remains on a person’s skin or other body sites indefinitely, whether or not they ever develop symptoms, and they remain capable of spreading it the entire time. Colonized patients continuously shed the organism onto bed linens, bedside furniture, and anything they touch, creating a persistent source of contamination in their immediate surroundings.
Healthcare Workers as Carriers
Healthcare workers’ hands are the primary vehicle that moves C. auris between patients and the surrounding environment. During routine care activities like taking vitals, repositioning a patient, or handling medical devices, workers can pick up the fungus on their hands, gloves, or clothing. If they then touch another patient or a clean surface without proper hand hygiene, the chain of transmission continues. This is transient contamination, not long-term colonization, but it happens frequently enough to sustain outbreaks when infection control practices slip.
Contaminated Surfaces and Equipment
The healthcare environment itself acts as a reservoir. High-touch surfaces near colonized patients, such as bed rails, call buttons, and bedside tables, become heavily contaminated through routine daily contact. C. auris is unusually hardy for a fungal organism. It can survive on dry surfaces for extended periods, far longer than most Candida species, which is one reason standard cleaning routines that work for other pathogens often fall short.
Shared medical equipment is another major route. The CDC specifically flags glucometers, temperature probes, blood pressure cuffs, ultrasound machines, nursing carts, ventilators, and physical therapy equipment as items that can carry C. auris between patients. Outbreak investigations have found that healthcare personnel are not always aware of their responsibility for cleaning mobile and shared equipment after each use, a gap that allows the fungus to travel well beyond a single patient’s room.
Why Nursing Homes and Long-Term Care Are Hit Hardest
Skilled nursing facilities and long-term acute care hospitals are the epicenters of C. auris transmission in the United States. Several factors converge in these settings to create ideal conditions for spread. Residents tend to have serious underlying medical conditions, frequent hospitalizations, and prolonged exposure to antibiotics or antifungal medications. Many require hands-on care and have indwelling devices like feeding tubes, IV lines, or tracheostomies that provide the fungus direct access to the body.
Facilities that care for residents on chronic mechanical ventilation are particularly vulnerable to outbreaks. Infection control in these settings is also more challenging than in acute care hospitals. Staffing constraints, shared rooms, and the communal nature of daily life in a nursing facility all increase the number of contact points where C. auris can move from one person to another. In one well-documented cluster in Chicago, the majority of colonized or infected individuals had resided in a long-term acute care hospital or a ventilator-capable skilled nursing facility within the prior three months.
How C. Auris Does Not Spread
C. auris is not an airborne pathogen. You cannot catch it by being in the same room as a colonized person without physical contact. It also poses virtually no risk to healthy people in everyday community settings like grocery stores, offices, or schools. The fungus overwhelmingly affects people who are already medically vulnerable and spending extended time in healthcare facilities. Casual household contact with a colonized family member, while not impossible, has not been a significant driver of transmission in surveillance data.
Why Standard Cleaning Often Fails
Part of what makes C. auris so difficult to control is that many common hospital disinfectants do not reliably kill it. Quaternary ammonium compounds, which are widely used for routine surface cleaning in healthcare, have limited effectiveness against this particular fungus. The CDC recommends using only products from a specific registry of disinfectants that have been tested and proven effective against C. auris. Even with the right products, thorough cleaning requires attention to every surface the patient or staff might have touched, a level of diligence that is difficult to sustain across busy facilities day after day.
Equipment decontamination is equally critical. The CDC advises labeling disinfected equipment and physically separating it from items that have not yet been cleaned, a simple step that reduces the chance of a caregiver grabbing a contaminated blood pressure cuff and carrying the fungus to the next patient’s room.
Screening and Early Detection
Because colonized individuals shed the fungus without showing symptoms, healthcare facilities in areas with known C. auris activity often screen new admissions, particularly patients transferring from other hospitals or long-term care settings. Screening typically involves a swab of the armpit and groin, the two sites where colonization is most reliably detected. Identifying carriers early allows facilities to implement contact precautions before the organism has a chance to spread to other patients or contaminate shared spaces. Without screening, a single unidentified carrier can seed an outbreak that persists for months.