Vaginal colonization with invasive Escherichia coli during pregnancy

|July 1, 1980

Summary

Escherichia coli (E. coli) K1 was found in 5-7% of pregnant women. If mothers carried E. coli K1 at delivery, 50% of their babies became colonized.

Area of Science:

Background:

The K1 antigen is a significant virulence factor in Escherichia coli.
Maternal colonization with specific bacteria can impact neonatal health outcomes.

Purpose of the Study:

To investigate the prevalence and transmission dynamics of K1 antigen-positive Escherichia coli in pregnant women and their neonates.
To understand the colonization patterns of E. coli K1 during pregnancy and at delivery.

Main Methods:

Longitudinal sample collection from pregnant women throughout gestation and at delivery.
Bacteriological isolation and identification of Escherichia coli with K1 antigen.
Assessment of neonatal colonization in relation to maternal status.

Main Results:

Prevalence of E. coli K1 isolations ranged from 5% to 7% during pregnancy.
Fifty percent of neonates were colonized when their mothers were positive for E. coli K1 at delivery.
Spontaneous loss or acquisition of E. coli K1 was infrequent, unlike Group B Streptococcus.

Conclusions:

Maternal carriage of E. coli K1 is observed during pregnancy with a notable rate of neonatal colonization at delivery.
E. coli K1 exhibits relatively stable colonization patterns in mothers compared to other bacteria like Group B Streptococcus.

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