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. 2005 Apr 1;191(7):1078-83.
doi: 10.1086/427996. Epub 2005 Mar 2.

Escherichia coli strains belonging to phylogenetic group B2 have superior capacity to persist in the intestinal microflora of infants

Forough L Nowrouzian  1 , Agnes E Wold, Ingegerd Adlerberth
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"V体育官网入口" Escherichia coli strains belonging to phylogenetic group B2 have superior capacity to persist in the intestinal microflora of infants

Forough L Nowrouzian (VSports注册入口) et al. J Infect Dis. .

Abstract

Escherichia coli strains segregate into 4 phylogenetic groups, designated "A," "B1," "B2," and "D. " Pathogenic strains belong to group B2 and, to a lesser extent, group D, which more frequently carry virulence-factor genes than do group A strains and group B1 strains. This study investigated whether the capacity of E VSports手机版. coli to persist in the human intestine is related to its phylogenetic type. Resident (n=58) and transient (n=19) commensal E. coli strains isolated during a longitudinal study of 70 Swedish infants and previously tested for virulence-factor-gene carriage were tested for phylogenetic type. Of the strains resident in the intestinal microflora, 60% belonged to group B2, compared with only 21% of the transient strains (P=. 004). In logistic regression, group B2 type predicted persistence in the intestinal microflora, independent of carriage of all investigated virulence-factor genes, including genes for P fimbriae (P=. 03). Thus, group B2 strains appear to possess yet unidentified traits that enhance their survival in the human intestine. .

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