Lactic acid bacteria and bifidobacteria were screened of their ability to f
erment fructooligosaccharides (FOS) on MRS agar. Of 28 strains of lactic ac
id bacteria and bifidobacteria examined, 12 of 16 Lactobacillus strains and
7 of 8 Bifidobacterium strains fermented FOS. Only strains that gave a pos
itive reaction by the agar method reached high cell densities in broth cont
aining FOS.