<;P>;PROBLEM TO BE SOLVED: To provide a new preventive and/or therapeutic substance for allergy and a food composition comprising the therapeutic substance. <;P>;SOLUTION: The new preventive and/or therapeutic substance for allergy uses a Bifidobacterium longum OLB6001 strain (Bifidobacterium longum OLB6001, the accession number: FERM P-13,610), a Bifidobacterium longum OLB6290 strain (Bifidobacterium longum OLB6290, the accession number: NITE P-75), and Bifidobacterium bifidum OLB6378 (Bifidobacterium bifidum OLB6378, the accession number: NITE BP-31). In addition, a food composition comprising the therapeutic substance is provided. <;P>;COPYRIGHT: (C)2007,JPO&INPIT