Capsular saccharides derived from serogroups W135 and Y of Neisseria meningitidis have altered levels of O-acetylation at the 7 and 9 positions of their sialic acid residues, and can be used to make immunogenic compositions. Relative to unmodified native saccharides, derivatives of the invention are preferentially selected during conjugation to carrier proteins, and conjugates of the derivatives show improved immunogenicity compared to native polysaccharides.

Disclosed is a vaccine comprising an immunologically effective amount of a polynucleotide comprising a nucleotide sequence encoding a targeting unit, a dimerization unit and an antigenic unit, wherein the antigenic unit comprises at least one betacoronavirus epitope. The vaccine is ideal for pandemic and epidemics as it can induce rapid, strong immune response with lower/fewer doses because the antigen is targeted to antigen presenting cells and the antigen is produced in the body.

The present disclosure relates to methods for treating cancer by intratumoral delivery of particles containing a Toll-like receptor 9 agonist (TLR9) and a tumor antigen, in which the TLR9 agonist is a polynucleotide or a chimeric compound thereof. The methods of the present disclosure involve injection of the particles into at least one tumor, and are effective for treating both injected and uninjected tumors of a mammalian subject. Additionally, the present disclosure provides immunogenic compositions containing the particles, as well as methods of manufacture thereof.

The present invention relates to the synthesis of GPI-related surface antigens of the parasite Toxoplasma gondii (T. gondii) and the resulting products obtained. These synthetic compounds are suitable for diagnosis of toxoplasmosis, as well as vaccine against toxoplasmosis, a diseases caused by infection with T. gondii.

Provided herein are immunogenic compositions comprising a recombinant modified vaccinia virus Ankara (MVA) comprising a nucleic acid sequence encoding a flagellin, and a nucleic acid sequence encoding a heterologous disease-associated antigen, wherein the immunogenic composition induces increased T-cell and antibody mediated immune responses specific for the heterologous disease-associated antigen when administered to a subject, e.g. a human subject, and related methods and uses.

This disclosure relates to immunogenic compositions and methods of enhancing an immune response to an antigen. In certain embodiments, the disclosure relates to virus-like carries comprising a TLR5 agonist on the exterior without an antigen.

Disclosed are compositions comprising an expressible nucleic acid sequence comprising a first nucleic acid sequence comprising a leader sequence or a pharmaceutically acceptable salt thereof; and a second nucleic acid sequence comprising a sequence that encodes a self-assembling polypeptide or a pharmaceutically acceptable salt thereof. In some embodiments, the expressible nucleic acid sequence further comprises a nucleic acid sequence encoding at least one viral antigen or a pharmaceutically acceptable salt thereof. In some embodiments, the expressible nucleic acid sequence further comprises at least one nucleic acid sequence encoding a linker. Also disclosed are pharmaceutical compositions comprising these compositions and methods of using the disclosed compositions.

HIV neutralizing peptides, sulfated HIV-1 envelope proteins and immunogenic fragments thereof are disclosed, as well as nucleic acids encoding these molecules and methods of producing these peptides, envelope proteins and fragments. Methods are also provided for the treatment or prevention of a human immunodeficiency type 1 (HIV-1 ) infection. The methods can include administering to a subject an HIV neutralizing peptide, sulfated HIV-1 envelope protein or immunogenic fragment thereof as disclosed herein. In several embodiments, administering the HIV neutralizing peptide, sulfated HIV-1 envelope protein or immunogenic fragment generates an immune response in a subject.

The present invention provides a complex for use in the prevention and/or treatment of cancer, the complex comprising a) a cell penetrating peptide, b) at least one antigen or antigenic epitope, and c) at least one TLR peptide agonist, wherein the components a)-c) are covalently linked. In particular, compositions for use in the prevention and/or treatment of cancer, such as a pharmaceutical compositions and vaccines are provided.

Provided herein are host cells capable of producing hybrid oligosaccharides and polysaccharides, wherein said hybrid oligosaccharides and polysaccharides do not comprise a hexose at the reducing end of their first repeat unit. Also provided herein are hybrid oligosaccharides or polysaccharides and bioconjugates which can be produced by the host cells described herein, wherein said bioconjugates comprise a carrier protein linked to a hybrid oligosaccharide or polysaccharide that does not comprise a hexose at the reducing end of its first repeat unit.