Cross-reactive immune response elicited by parenteral Vi polysaccharide typhoid vaccine against non-typhoid Salmonellae

Pakkanen, Sari H. and Kantele, Jussi M. and Herzog, Christian and Kantele, Anu. (2014) Cross-reactive immune response elicited by parenteral Vi polysaccharide typhoid vaccine against non-typhoid Salmonellae. Vaccine : the official journal of the International Society for Vaccines, 32 (5). pp. 544-551.

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Official URL: http://edoc.unibas.ch/dok/A6243533

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Despite 155000 deaths and over 90 million cases - and the current emergence of antimicrobial resistance - no vaccines are available against non-typhoid Salmonellae (NTS). We recently presented immunological arguments for using the oral Salmonella Typhi Ty21a as surrogate vaccine against NTS strains: Ty21a elicits intestinal antibodies against typhoidal O-9,12 antigen, and numerous NTS strains share one or both of these structures with S. Typhi. The Vi polysaccharide vaccine can, presumably because of contaminating typhoidal lipopolysaccharide, also elicit a humoral response to O-9,12, although a lower one in magnitude than the Ty21a. In this study, the Vi vaccine was explored for cross-reactive immune response to various NTS strains, and compared to that elicited by the Ty21a vaccine.; Volunteers immunized with the Vi polysaccharide (Typherix(®); n=25) were investigated for circulating plasmablasts secreting antibodies reactive with six NTS serotypes. The results were compared to those for 25 age- and gender-matched volunteers vaccinated with Ty21a (Vivotif(®)), as partly presented in our previous study. The cross-reactive plasmablasts elicited by the Vi vaccine were also analyzed for homing receptor expressions.; 49 out of 50 vaccinees showed a cross-reactive plasmablast response against S. Enteritidis sharing both O-9 and O-12 antigens with S. Typhi (mean: 95%CI 37: 19-55 and 363: 234-493 plasmablasts/10(6) PBMC in the Vi and the Ty21a group, respectively). The response against strains only sharing O-12 was weaker (22: 8-38 and 222: 105-338 against S. Typhimurium). Strains without typhoidal O-antigens generated no significant reactivity. The cross-reactive plasmablasts elicited by the Vi vaccine had systemic homing properties.; The Vi vaccine elicited an immune response cross-reactive with several NTS strains. This response was lower than that in Ty21a-vaccinated volunteers. The clinical significance of these responses deserves further research with respect to both gastrointestinal and invasive NTS (iNTS) disease.
Faculties and Departments:09 Associated Institutions > Swiss Tropical and Public Health Institute (Swiss TPH)
UniBasel Contributors:Herzog, Christian
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Elsevier ; [Online:] Amsterdam
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:05 Sep 2018 07:54
Deposited On:18 Jul 2014 09:10

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