Bacteria of the stenotrophomonas genus and/or growth inducer of said bacteria for preventing and/or treating atopic dermatitis

A method for the prevention and/or treatment of atopic dermatitis which comprises applying to a subject in need thereof bacteria of at least one strain of Stenotrophomonas and/or growth inducer of Stenotrophomonas.

Method of cosmetic treatment comprising a step of applying on dry skin a cosmetic composition comprising at least one strain of the Stenotrophomonas genus and/or at least one growth inducer of bacteria of the Stenotrophomonas genus.

In vitro method for prognosis and/or diagnosis of atopic dermatitis comprising the steps consisting in:

• a) measuring the level of bacteria of the Stenotrophomonas genus in a sample from an area suspected to be a lesion area or an area suspected to become a lesion area of an individual,
• b) deducing from the measurement obtained in step a) whether the individual has a risk of having or has atopic dermatitis.

Method for selecting a growth inducer of bacteria of the Stenotrophomonas genus, comprising the steps consisting in:

• placing a compound to be tested in contact with bacteria of the Stenotrophomonas genus,
• measuring the growth of bacteria in the presence of said compound to be tested, and
• selecting, as a Stenotrophomonas growth inducer, a compound capable of improving the growth of bacteria with respect to their growth in the absence of said compound.