bifidus factor

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bif·i·dus fac·tor

an unidentified substance associated with Lactobacillus bifidus subsp. pennsylvanicus, present in mammalian milk.
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A breast-fed infant derives many benefits, one of which is that breast milk contains bifidus factor, a substance that promotes the growth of bifidobacteria in the child's colon, giving the child a greater ability to stave off infections as compared with bottle-fed infants.
Researchers found that some strains could manage quite well, provided that special bacterial foods called bifidus factors were present.