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Neonatal gut colonization by Staphylococcus aureus strains with certain adhesins and superantigens is negatively associated with subsequent development of atopic eczema

Journal article
Authors Forough Nowrouzian
Annika Ljung
Staffan Nilsson
Bill Hesselmar
Ingegerd Adlerberth
Agnes E Wold
Published in British Journal of Dermatology
Volume 180
Issue 6
Pages 1481-1488
ISSN 0007-0963
Publication year 2019
Published at Institute of Clinical Sciences, Department of Pediatrics
Institute of Biomedicine, Department of Infectious Medicine
Pages 1481-1488
Language en
Links dx.doi.org/10.1111/bjd.17451
Keywords hay-fever, prevalence, infants, asthma, genes
Subject categories Infectious Medicine, Dermatology and Venereal Diseases

Abstract

Background Insufficient early immune stimulation may predispose to atopic disease. Staphylococcus aureus, a skin and gut colonizer, produces the B-cell mitogen protein A and T-cell-activating superantigens. Early gut colonization by S. aureus strains that possess the superantigens encoded by the enterotoxin gene (egc) cluster and elastin-binding protein is negatively associated with development of atopic eczema. Objectives To investigate (i) whether these findings could be replicated in a second birth cohort, FARMFLORA, and (ii) whether nasal colonization by S. aureus also relates to subsequent atopic eczema development. Methods Faecal samples and nasal swabs from infants in the FARMFLORA birth cohort (n = 65) were cultured for S. aureus. Individual strains were distinguished by random amplified polymorphic DNA and assessed for adhesin and superantigen gene carriage by polymerase chain reaction. Atopic eczema at 18 months of age was related to nasal and gut S. aureus colonization patterns during the first 2 months of life (well before onset of eczema). Results Staphylococcus aureus colonization per se was unrelated to subsequent eczema development. However, gut S. aureus strains from the infants who subsequently developed atopic eczema less frequently carried the ebp gene, encoding elastin-binding protein, and superantigen genes encoded by egc, compared with strains from children who remained healthy. Nasal colonization by S. aureus was less clearly related to subsequent eczema development. Conclusions The results precisely replicate our previous observations and may suggest that mucosal colonization by certain S. aureus strains provides immune stimulation that strengthens the epithelial barrier and counteracts the development of atopic eczema.

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