Role of the eaeA gene in experimental enteropathogenic Escherichia coli infection

J Clin Invest. 1993 Sep;92(3):1412-7. doi: 10.1172/JCI116717.


Enteropathogenic Escherichia coli (EPEC) infections are a leading cause of infant diarrhea in developing countries. Recently eaeA, a gene necessary for the characteristic intimate attachment of EPEC to epithelial cells in tissue culture, was described. We conducted a randomized, double-blind study to determine the role of the eaeA gene in human EPEC infection. 11 adult volunteers ingested 2 x 10(10) colony-forming units of O127:H6 EPEC strain E2348/69, and an equal number received the same dose of an isogenic eaeA deletion mutant constructed from E2348/69. Volunteers were monitored for the development of diarrhea, fever, and systemic and gastrointestinal complaints. Diarrhea developed in all 11 volunteers who received E2348/69 and in 4 of 11 who received the mutant (P = 0.002). Fever was more common in recipients of the wild-type strain (P = 0.024). Stool volumes were lower in recipients of the mutant. All volunteers seroconverted to E2348/69 LPS, but the geometric mean peak titers of serum IgG and IgA in recipients of the mutant were lower than those of recipients of the wild-type strain. IgA against LPS was detected in the jejunal fluid of six of six recipients of E2348/69 and 5/6 recipients of the mutant. This study unambiguously assigns a role for eaeA as an EPEC virulence gene, but the residual diarrhea seen in recipients of the mutant indicates that other factors are involved.

Publication types

  • Clinical Trial
  • Randomized Controlled Trial
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Adhesins, Bacterial*
  • Adult
  • Antibodies, Bacterial / biosynthesis
  • Bacterial Adhesion*
  • Bacterial Outer Membrane Proteins*
  • Carrier Proteins*
  • Diarrhea / microbiology*
  • Double-Blind Method
  • Escherichia coli / genetics*
  • Escherichia coli / pathogenicity*
  • Escherichia coli Infections / immunology
  • Escherichia coli Infections / microbiology*
  • Escherichia coli Proteins*
  • Genes, Bacterial
  • Humans
  • Sequence Deletion


  • Adhesins, Bacterial
  • Antibodies, Bacterial
  • Bacterial Outer Membrane Proteins
  • Carrier Proteins
  • Escherichia coli Proteins
  • eaeA protein, E coli