A vaccine delivery method is presented that includes a composition including as one component a slurry matrix that is a liquid at room temperature and a gel at physiological pH, physiological salt concentrations and/or physiological temperatures and as a second component one or more antigens. Also included are methods of inducing an immune response in a subject and vaccinating a subject by administering such compositions.

Adjuvants comprising chitosan cross-linked with an aldehyde or mannosylated chitosan are provided herein. Methods of making the adjuvants and methods of combining or linking the adjuvants with antigens are also provided. The adjuvant-antigen combinations can be used in vaccine formulations and the vaccine formulations can be used in methods to vaccinate animals against the source of the antigen or to enhance the immune response in a subject.

Disclosed herein are artificial Invaplexes comprising deacylated lipopolysaccharides and methods of making and using thereof.

Embodiments described herein relate to combinatorial compositions and uses thereof, for example, as vaccine adjuvant compositions, for enhancing immune response, for inducing differentiation of nave T cells to differentiate into IFN--producing T cells, and for preventing and treating infections. The combinatorial composition comprises TLR and CLR agonists. The combinatorial composition comprises at least one TLR4 agonist and at least one Dectin-1 agonist, wherein the at least TLR4 agonist is monophosphoryl lipid A (MPLA) or glycopyranosyl lipid A (GLA), or the combinatorial composition comprises at least one TLR7/8 agonist and at least one Mincle agonist.

This invention relates to immunogenic compositions, particularly vaccine compositions, for use in providing protection against illness caused by bacterial infection with Shigella strains.

A novel consortium used as potent vaccine for treating of enteric fever, comprised of isolated Outer Membrane Vesicles (OMVs) taken from two different strains of typhoidal Salmonella species.

Disclosed is the attenuated Salmonella typhi vaccine Ty21a utilized as a vector for Shigella and/or enterotoxogenic E. coli genes stably integrated in the Ty21a chromosome. These genes include a heterologous Shigella sonnei O-antigen biosynthetic gene region that comprises the wzz gene and expresses Shigella sonnei form 1 O-antigen, as well as a heterologous acid resistance biosynthetic gene system comprising a YbaS gene, which enables increased stability of the Ty21a vector at pH 2.5 relative to Ty21a without the integrated acid resistance biosynthetic gene system.

The present invention relates to Salmonella mutant strains and their use as a vaccine for preventing Salmonella infection, in particular in eggs.

The present invention is directed to a bioconjugate vaccine, such as an O1-bioconjugate vaccine, comprising: a protein carrier comprising a protein carrier containing at least one consensus sequence, D/E-X-N-Z-S/T, wherein X and Z may be any natural amino acid except proline; at least one antigenic polysaccharide from at least one pathogenic bacterium, linked to the protein carrier; and, optionally, an adjuvant. In another aspect, the present invention is directed to a method of producing an O1-bioconjugate in a bioreactor comprising a number steps.

Described is a method for the generation of a live vaccine containing stable bacteria carrying at least three attenuating mutations and a vaccine containing bacteria obtained by said method.