Composition (A) of bacteria with immunomodulating activity comprising at least one of the strains Lactobacillus acidophilus PTA-4797; L. plantarum PTA-4799; L. salivarius PTA-4800; L. paracasei PTA-4798; Bifidobacterium bifidum PTA-4801 and B. lactis PTA-4802, is new.