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Infection and Immunity, January 2004, p. 168-175, Vol. 72, No. 1
0019-9567/04/$08.00+0     DOI: 10.1128/IAI.72.1.168-175.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Plant Cell-Based Intimin Vaccine Given Orally to Mice Primed with Intimin Reduces Time of Escherichia coli O157:H7 Shedding in Feces

Nicole A. Judge,1 Hugh S. Mason,2 and Alison D. O'Brien1*

Department of Microbiology and Immunology, Uniformed Services University of the Health Sciences, Bethesda, Maryland 20814-4799,1 School of Life Sciences, Arizona State University, Tempe, Arizona 85287-45012

Received 29 July 2003/ Returned for modification 12 September 2003/ Accepted 8 October 2003

Intimin is the primary adhesin of Escherichia coli O157:H7, the most common infectious cause of bloody diarrhea in the United States and the leading cause of acute kidney failure in children who develop hemolytic uremic syndrome. Cattle are the primary reservoir of E. coli O157:H7. Indeed, most cases of E. coli O157:H7 infection in the United States occur after ingestion of contaminated undercooked hamburger or produce that had contact with bovine manure. Because intimin is required for persistent colonization of neonatal calves and adult cattle, we hypothesized that an intimin-based vaccination strategy in calves would reduce colonization of cattle with E. coli O157:H7. To test this concept in a small-animal model, we developed transgenic tobacco plant cells that express the carboxy-terminal host cell-binding domain of E. coli O157:H7 intimin. Mice were either immunized intraperitoneally with intimin expressed from the plant cells, fed transgenic plant cells, or both. Here we show that these mice generated an intimin-specific mucosal immune response when primed parenterally and then boosted orally and also exhibited a reduced duration of E. coli O157:H7 fecal shedding after challenge.

* Corresponding author. Mailing address: Department of Microbiology and Immunology, Uniformed Services University of the Health Sciences, Bethesda, Maryland 20814-4799. Phone: (301) 295-3400. Fax: (301) 295-3773. E-mail: aobrien{at}usuhs.mil.

Editor: J. T. Barbieri

Infection and Immunity, January 2004, p. 168-175, Vol. 72, No. 1
0019-9567/04/$08.00+0     DOI: 10.1128/IAI.72.1.168-175.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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