Candida infection in the axilla
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Candida auris Infection and Colonization in the Axilla: Key Insights
Prevalence and Risk of Axillary Colonization by Candida auris
Candida auris is a multidrug-resistant fungal pathogen that frequently colonizes the skin, with the axilla (armpit) being one of the most common sites, especially in healthcare settings. Studies show that about 95% of C. auris colonization cases involve the skin, and the axilla and groin are the primary areas sampled for surveillance and screening in hospitals and long-term care facilities Eix2022Montoya2024. Colonization in these areas can persist for months and is a significant risk factor for subsequent invasive infections, particularly in critically ill or immunocompromised patients Eix2022Montoya2024.
Transmission and Outbreaks in Healthcare Settings
C. auris is primarily a healthcare-associated pathogen, with outbreaks often linked to contaminated medical equipment and surfaces. The axilla is a notable site for both colonization and transmission. For example, reusable axillary temperature probes have been directly implicated in hospital outbreaks, serving as reservoirs for the fungus and facilitating its spread among patients . Environmental persistence and patient-to-patient transmission are major concerns, especially in intensive care units and facilities with high patient turnover Eix2022Eyre2018.
Detection and Surveillance Methods for Axillary Colonization
Rapid and accurate detection of C. auris colonization in the axilla is crucial for infection control. Traditional culture-based methods using axilla/groin swabs are sensitive but can take up to two weeks for results Sexton2018Sexton2018. Newer molecular assays, such as SYBR green-based qPCR and T2 Magnetic Resonance (T2MR), offer faster turnaround times (within hours) and high sensitivity and specificity for detecting C. auris in axilla/groin swabs Sexton2018Sexton2018. High-throughput platforms have also been validated for efficient screening in high-risk settings, further supporting outbreak control efforts .
Colonization Patterns and Alternative Screening Sites
While the axilla and groin are standard sites for screening, studies have found that C. auris can colonize multiple body sites, including the nares, hands, and other skin folds Eix2022Montoya2024. Some research suggests that nares/hands swabs may yield more consistent and higher detection rates than axilla/groin swabs, indicating that broader screening strategies could improve surveillance accuracy Cano2024Wickes2020. However, the axilla remains a key site due to its frequent involvement in colonization and outbreaks.
Community vs. Healthcare-Associated Colonization
Current evidence indicates that C. auris colonization of the axilla is almost exclusively associated with healthcare exposure. Studies in newly hospitalized patients without recent healthcare contact found no cases of community-acquired C. auris in the axilla or groin, reinforcing the importance of hospital-based transmission . This highlights the need for strict infection control practices in healthcare environments to prevent the spread of C. auris.
Implications for Infection Control and Prevention
Given the high rates of skin colonization, especially in the axilla, and the challenges posed by multidrug resistance, prevention remains the most effective strategy against C. auris outbreaks. Regular screening of high-risk patients, decontamination of reusable equipment, and robust infection control protocols are essential to limit transmission Eix2022Eyre2018Montoya2024. Further research is needed to refine screening methods and develop effective decolonization strategies.
Conclusion
Candida auris infection and colonization in the axilla are significant concerns in healthcare settings due to the pathogen’s persistence, resistance, and potential for rapid spread. The axilla is a primary site for colonization and transmission, making it a critical focus for surveillance and infection control efforts. Rapid diagnostic methods and comprehensive screening strategies are vital for early detection and containment of outbreaks. Prevention and strict adherence to infection control measures remain the best defense against this emerging threat.
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