| Literature DB >> 18468742 |
Robin McKenzie1, Malabi M Venkatesan, Marcia K Wolf, Dilara Islam, Shannon Grahek, Andrea M Jones, Arlene Bloom, David N Taylor, Thomas L Hale, A Louis Bourgeois.
Abstract
Among Shigella serotypes Shigella dysenteriae type 1 produces the most severe disease, including cases of hemolytic-uremic syndrome and pandemic outbreaks. WRSd1 is a live S. dysenteriae 1 strain attenuated by deletion of the virG(icsA) gene, which encodes a protein that mediates intercellular spread, and stxA and stxB, which encode the Shiga toxin. In this Phase I trial five groups of eight subjects ingested escalating doses of WRSd1 ranging from 10(3) to 10(7)CFU. No subject experienced fever or shigellosis, but 20% had diarrhea. Approximately two-thirds of subjects developed an IgA-ASC response to LPS. Days of fecal shedding of the vaccine strain, but not dose ingested, correlated with stronger immune responses. These results suggest that to be effective an attenuated Shigella vaccine must colonize well.Entities:
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Year: 2008 PMID： 18468742 DOI： 10.1016/j.vaccine.2008.03.079
Source DB: PubMed Journal: Vaccine ISSN： 0264-410X Impact factor: 3.641