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Dermatology

Skin Microbiota #17

Skin health
Atopic dermatitis

By Pr. Satu Pekkala
Academy of Finland Research Fellow, Faculty of Sport and Health Sciences, University of Jyväskylä, Finland

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About this article

Created 17 January 2023
Updated 19 January 2023

ATOPIC DERMATITIS: SKIN MYCOBIOTA UNDER THE MICROSCOPE

Schmid B, Künstner A, Fähnrich A et al. Dysbiosis of skin microbiota with increased fungal diversity is associated with severity of disease in atopic dermatitis. J Eur Acad Dermatol Venereol. 2022 Jun 21.

Atopic dermatitis (AD) is a complex and multifactorial inflammatory skin disease in which genetics, the immune system, and microbes play a role. For example, the skin of AD patients generally has an increased abundance of Staphylococcus aureus. But what about fungal communities? A recent study has shed some light on this little-known area. Skin swabs were taken from 16 AD patients and 16 healthy individuals at four skin sites (antecubital crease, dorsal neck, glabella, and vertex). To observe the course of the disease, the AD patients were sampled at three time points (weeks 0, 2, and 4) and the controls at two time points (weeks 0 and 4). An analysis of the 320 swabs showed that the Malassezia fungus predominated in all subjects, whether healthy or ill. However, in patients suffering from severe AD, this dominance was reduced in favor of fungi such as Candida or Debaryomyces, resulting in greater fungal diversity. As for bacteria, AD was characterized by lower levels of Cutibacterium and a greater relative abundance of Staphylococcus, particularly S. aureus and S. epidermidis. A higher presence of S. aureus may favor the proliferation of Candida, a synergistic activity between the two microorganisms having previously been shown. The study also showed a link between skin dysbiosis and the severity of AD: the bacterial and fungal communities of patients with severe AD differed significantly from those of controls and patients with mild-to-moderate forms of the disease. The skin communities of the latter two groups (mild-to-moderate AD and controls) were similar overall, with some distinctions in the bacterial communities (more staphylococci and less cutibacteria in mild-to-moderate AD versus no AD). Thus, a pronounced dysbiosis of the microbiota is characteristic of severe forms of AD, but not of less severe forms.

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Skin microbiota Mycobiota Atopic Dermatitis Skin health Infant

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    Created 17 January 2023
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