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Exclusionary Effects
The
normal flora produces conditions that tend to block the establishment of
e4xtraneous pathogens and their ability to infect the host. The bifidobacteria
in the colon of the breastfed infant produce an environment inimical to
colonization by enteric pathogens, this protective effect is aided by ingested maternal
IgA. Breastfeeding has clearly shown to help to protect infant from enteric
bacterial infections.
Production of Essential Nutrients by Normal flora
In
humans, member of the vitamin B group and vitamin K are produced by normal
flora. Bacterial vitamin production is reduced during broad spectrum antibiotic
therapy, and supplementation with vitamin B complex is indicated in
malnourished individuals.