Synthesis and immunogenicity evaluation of Salmonella enterica serovar Paratyphi A O-specific polysaccharide conjugated to diphtheria toxoid.

Abstract:

:Salmonella enterica serovar Paratyphi A (S. Paratyphi A) is a human restricted pathogen that can cause systemic infection (paratyphoid fever) with recently increased incidence particularly in developing countries. Currently there is no licensed vaccine for prevention of infection from S. Paratyphi A. In this study the O-specific polysaccharide (OSP) of S. Paratyphi A was conjugated to diphtheria toxoid (DT) with and without adipic acid dihydrazide (ADH) as a linker. Binding of the OSP to a carrier protein was intended to convert a T-cell independent OSP response to a T-cell dependent response inducing higher levels of anti-OSP antibodies and immunological memory. These conjugates (OSP-AH-DT and OSP-DT) were evaluated for their immunogenicity in mice. The S. Paratyphi A OSP-DT conjugate induced a poor anti-OSP response less than that observed with LPS while the OSP-AH-DT conjugate induced a significantly higher antibody titer compared with LPS alone. The study also demonstrated diphtheria toxoid as a potential carrier protein for conjugate vaccine candidates using S. Paratyphi A OSP.

journal_name

Hum Vaccin Immunother

authors

Ali A,An SJ,Cui C,Haque A,Carbis R

doi

10.4161/hv.28130

subject

Has Abstract

pub_date

2014-01-01 00:00:00

pages

1494-8

issue

6

eissn

2164-5515

issn

2164-554X

pii

28130

journal_volume

10

pub_type

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