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Atopic dermatitis (AD) is an inflammatory and pruritic dermatosis of multifactorial origin. Topical steroids are the first line treatment for severe AD however alternatives treatment are increasingly needed. A biological concentrate was elaborated from culture of an Avène aquatic microflora isolate namely Aquaphilus dolomiae. Numerous extracts were evaluated in relevant AD in vitro models with human keratinocytes. Among these extracts, a particular one I-modulia® was found to be remarkable in terms of pharmacological activities: innate immunity modulating by agonizing Toll like receptor (TLR)2, TLR4 and TLR5, induction of anti-microbial peptides, inhibition of cytokines characteristics of T helper (Th)1, Th2 and Th17 responses, inhibition of Protease-activated-receptor (PAR) 2 and Thymic-stromal-lymphopoeitin (TSLP) both being known to be upregulated in pruritus. Additionally, when human dendritic cells (DC) were stimulated in vitro by Staphylococcus aureus secretomes from AD children lesions, I-modulia® was capable to induce IL-10 secretion to activate regular T lymphocytes and rendered DC tolerogenic. I-modulia®, extract of biotech origin incorporated in emollient, displays anti-inflammatory, anti-pruritus activities, restores homeostasis immune and ameliorates AD in young infant.