James E Galen

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Simultaneous expression of CFA/I and CS3 colonization factor antigens of enterotoxigenic Escherichia coli by delta aroC, delta aroD Salmonella typhi vaccine strain CVD 908.

J A Girón; J G Xu; C R González; D Hone; J B Kaper; M M Levine (Profiled Authors: James B Kaper; Myron M Levine)

Center for Vaccine Development, School of Medicine, University of Maryland, Baltimore 21201, USA.
Vaccine 1995;13(10):939-46.

Among the known colonization factors of enterotoxigenic Escherichia coli (ETEC), CFA/I and CS3 (the common antigen in the CFA/II family of fimbrial antigens) are two of the most prevalent fimbrial antigens found in clinical isolates but are never expressed by the same wild-type strain. We manipulated the genetic determinants encoding CS3 and CFA/I fimbriae so that these two important colonization factors are expressed simultaneously in attenuated Salmonella typhi live oral vaccine strain CVD 908, including after growth in liquid medium (CFA/I is poorly expressed by wild-type ETEC in broth culture). The recombinant fimbrial structures produced by CVD 908 are morphologically indistinguishable from the CS3 fibrillae and CFA/I rod-like fimbriae produced by ETEC, and are recognized by monospecific CS3 and CFA/I antibodies. This prototype construct may prove useful in investigating the live vector approach to immunoprophylaxis of ETEC diarrheal disease.

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