The invention relates to a pharmaceutical and/or dietetic composition for increasing the impact of the immune defense of higher living beings, wherein bacteria of the species Lactobacillus fermentum from at least one of the strains K1-Lb1 or K1-Lb6 or K2-Lb4 or K6-Lb4 or K7-Lb1 or K8-Lb1 or K9-Lb6 are contained in order to control the adaptive and natural immune defense by means of T helper 1 and T helper 2 cells and/or bacteria of the species Lactobacillus fermentum from at least one of the strains K2-Lb6 or K11-Lb3 are contained in order to strengthen the native immune defense.
