The inventive subject matter includes a viral-vectored composition made of a bacterial expression vehicle expressing one or more recombinant viral protein antigens and its method of use. In particular, this invention relates to a vaccine for oral administration. Preferably, the bacterial expression vehicle is Bacillus subtilis.

The invention provides an immunogenic composition comprising staphylococcal antigens, containing protein antigens and conjugates of capsular polysaccharides, n particular Hla, ClfA, SpA and conjugates of capsular polysaccharides. Adjuvanted formulations are also provided. The invention may find use in the prevention and treatment of staphylococcal infections, in particular S. aureus infection and disease.

The present disclosure provides a process for purifying high-molecular weight bacterial polysaccharides (e.g., cell wall polysaccharides), and polypeptide-polysaccharide conjugates thereof, suitable for use in immunogenic 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.

The present invention is directed towards conjugates comprising fragments of the capsular polysaccharide of Type III Group B Streptococcus (GBS). Suitable fragments may be produced synthetically or by depolymerisation of native polysaccharide.

The present application provides methods and uses of O-oligosaccharyltransferase (O-OTases) for generating vaccines. In particular, the present application provides a method of synthesizing a glycoprotein comprising glycosylation of pilin-like protein ComP using a PglL.sub.ComP O-OTase. Uses of glycoproteins synthesized by glycosylating ComP using PglL.sub.ComP O-OTase, particularly for the preparation of vaccines and the like, including a vaccine to Streptococcus, is also provided.

The invention provided a method for preparing a bacterial polysaccharide-modified recombinant fusion protein and use of the bacterial polysaccharide-modified recombinant fusion protein. The method comprises: co-expressing a recombinant fusion protein and the Neisseria meningitidis O-oligosaccharyltransferase PglL in an O-antigen ligase gene-defective bacterium, and linking a polysaccharides endogenous or exogenous for the bacterium to the recombinant fusion protein by the O-oligosaccharyltransferase PglL, to obtain the bacterial polysaccharide-modified recombinant fusion protein. The protein can be used for preparing antibodies against bacterial polysaccharides and vaccines.

An effective Pseudomonas aeruginosa vaccine may require one or several antigenic components, and so various antigens of P. aeruginosa are identified for use in immunisation. These polypeptides may optionally be used in combination with other nosocomial antigens.

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.

This invention is directed to composition, vaccines, tools and methods in the treatment and prevention of Bordetella pertussis. In particular, the invention is directed to a three-pronged approach that involves removal of the nonessential vaccine components, use of a nondenatured, genetically detoxified mutant, and adding virulence factors.