Escherichia coli serogroups in breast-fed and bottle-fed infants.
1) Eighty-seven breast-fed and 95 bottle-fed infants were examined for differences in Escherichia coli serogroup pattern. 2) The serogroup composition was less complex in breast-fed infants. Fewer serogroups were found in the individual breast-fed child. However, with few exceptions, the same O groups were found in the two groups of infants. The prevalent O groups were among those also found most frequently in faeces from adults. 06 strains were more common in the breast-fed group, while 07 and 016 were not at all found in that group. 3) A special search for E. coli strains with Kl antigen showed that this antigen predominated in the bottle-fed infants. 4) Klebsiella and other Enterobacteriaceae were more frequently found among bottle-fed infants. 5) It is concluded that the intestinal milieu exerts a selective pressure which may result in a selection of different serotypes in two different intestinal milieus such as those examined.
D000818:Animals; D001903:Bottle Feeding; D001942:Breast Feeding; D004755:Enterobacteriaceae / Q000302:isolation & purification; D004926:Escherichia coli / Q000276:immunology / Q000302:isolation & purification*; D005243:Feces / Q000382:microbiology; D006736:Horses; D006801:Humans; D007106:Immune Sera; D007223:Infant; D007709:Klebsiella / Q000302:isolation & purification; D011817:Rabbits; D012703:Serotyping
D007106:Immune Sera