PURPOSE: A microbial agent containing Lactobacillus plantarum K-1 which improves an anti-allergic effect and immunity, and treats atopic dermatitis is provided to control various diseases.CONSTITUTION: Lactobacillus plantarum K-1 which is a kind of lactic acid bacteria enhances immunity and an anti-allergic effect, and treats allergic diseases, atopic dermatitis, rhinitis, and pruritus. A microbial agent contains the Lactobacillus plantarum strain or a culture medium thereof as an active ingredient.COPYRIGHT KIPO 2013.