Abstract
Summary
The emergence and persistence of Gram-positive cocci, lactobacilli and coli-form organisms in the gastrointestinal tracts of Swiss mice from birth to weaning were investigated. Changes in normal bacterial ecology due to oral feedings with both normal and abnormal organisms were described. Proteus vulgaris and to a lesser extent Pseu-domonas aeruginosa delayed the emergence and decreased the quantity of both lactobacilli and Escherichia coli. These mice had moderate increases in growth rates over those of the control groups. Recently isolated Shi-gella species when fed to newborn mice survived passage through the stomach. They did not persist in the G. I. tract nor cause changes in the mice.
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