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Immunogenicity and protective efficacy of nanoparticle formulations of L-SseB against infection. | LitMetric
, a Gram-negative pathogen, has over 2500 serovars that infect a wide range of hosts. In humans, causes typhoid or gastroenteritis and is a major public health concern. In this study, SseB (the tip protein of the pathogenicity island 2 type III secretion system) was fused with the LTA1 subunit of labile-toxin from enterotoxigenic to make the self-adjuvanting antigen L-SseB. Two unique nanoparticle formulations were developed to allow multimeric presentation of L-SseB. Mice were vaccinated with these formulations and protective efficacy determined challenging the mice with serovars. The polysaccharide (chitosan) formulation was found to elicit better protection when compared to the squalene nanoemulsion. When the polysaccharide formulation was used to vaccinate rabbits, protection from challenge was elicited. In summary, L-SseB in a particulate polysaccharide formulation appears to be an attractive candidate vaccine capable of broad protection against
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