Candida skin infection
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Candida Skin Infection: Pathogenesis, Emerging Species, and Immune Response
Pathogenesis of Candida Skin Infections
Candida skin infections are primarily caused by the interplay between fungal virulence factors and host immune defenses. Candida albicans, the most common species, utilizes various mechanisms to colonize and invade the skin. It expresses surface adhesion molecules to attach to epithelial surfaces and secretes aspartyl proteinase enzymes to penetrate keratinized cells. The formation of hyphae, which can sense and respond to contact (thigmotropism), further aids in deeper tissue invasion Odds1994Mayer2013. The ability of C. albicans to rapidly alter its phenotype enhances its pathogenic potential, making it a formidable pathogen .
Emerging Candida Species and Antifungal Resistance
While C. albicans remains the predominant cause of Candida skin infections, non-albicans species are emerging with increased frequency. Species such as Candida auris, Candida duobushaemulonii, and Candida africana have been identified as significant pathogens. C. auris, in particular, poses a major health threat due to its high resistance to common antifungal agents like azoles, echinocandins, and polyenes, and its difficult identification in clinical settings Espinosa-Hernández2020Proctor2021Eix2022. These emerging species often exhibit higher resistance to conventional treatments, necessitating the development of new diagnostic and therapeutic strategies Espinosa-Hernández2020Spampinato2013.
Immune Response to Candida Infections
The human skin employs robust defense mechanisms against Candida infections, involving both non-immune and immune cells. The skin barrier, along with residential and recruited immune cells, plays a crucial role in preventing fungal invasion. T-lymphocyte responses and epidermal proliferation are key components of the host defense against Candida Odds1994Kühbacher2017. Studies have shown that specific genetic pathways are involved in immune recognition and response to C. albicans, highlighting the importance of tailored immune responses based on the site of infection Kashem2016Lopes2021.
Candida auris: A Unique Threat
Candida auris is particularly concerning due to its ability to persist on the skin and its high transmission potential in healthcare settings. It colonizes multiple body sites, often eluding standard screening methods. This persistence on the skin can lead to invasive infections, especially in hospitalized patients with compromised skin barriers due to medical procedures Proctor2021Eix2022Huang2020. The use of chlorhexidine gluconate (CHG) has been shown to suppress C. auris growth without significantly disrupting the commensal skin microbiome, offering a potential strategy for infection control Proctor2021Huang2020.
Conclusion
Candida skin infections are a complex interplay of fungal virulence and host immune defenses. While C. albicans remains a major pathogen, the rise of drug-resistant non-albicans species like C. auris underscores the need for improved diagnostic and therapeutic approaches. Understanding the mechanisms of pathogenesis and immune response is crucial for developing effective strategies to combat these infections.
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