The present invention relates to a vaccine comprising a nucleic acid construct such as a DNA construct especially a nucleic acid construct comprising sequences encoding invariant chain operatively linked to antigenic protein or peptide encoding sequences. The vaccine stimulates an immune response, especially an immune response in an MHC-I dependent, but CD4.sup.+ T-cell independent manner.

A recombinant attenuated Mopeia virus (MOPV) comprising a recombinant genomic S segment that encodes a nucleoprotein having attenuated exonuclease activity, and optionally further encodes a non-MOPV arenavirus glycoprotein. Use of the recombinant attenuated MOPV to induce an immune response in a subject.

The present invention provides novel nanoparticle presented vaccine compositions that are stabilized with a locking domain. Various immunogens can be employed in the preparation of the vaccine compositions, including viral immunogens such as HIV-1 and Ebola viral immunogens, and non-viral immunogens such as immunogens derived from bacteria, parasites and mammalian species. The invention also provides methods of using such vaccine compositions in various therapeutic applications, e.g., for preventing or treating viral infections.

Disclosed herein are methods of forming compounds and exemplary stable compounds in the nature of a conjugated compound at refrigerated or room temperature, which in some embodiments comprises an antigen and virus particle mixed in a conjugation reaction to form a conjugate mixture, such that the conditions and steps of forming these products allow for use of the conjugate mixture as a vaccine, including but not limited to use as a vaccine against various pathogens including for treatment of diseases caused by novel coronaviruses (including SARS-COV 2).

Disclosed herein is a vaccine comprising an antigen and IL-33. Also disclosed herein is a method for increasing an immune response in a subject in need thereof. Further disclosed herein is a method for treating cancer in a subject in need thereof. The methods may comprise administering the vaccine to the subject.

The present application relates to arenaviruses with rearrangements of their open reading frames (“ORF”) in their genomes. In particular, described herein is a modified arenavirus genomic segment, wherein the arenavirus genomic segment is engineered to carry a viral ORF in a position other than the wild-type position of the ORF. Also described herein are trisegmented arenavirus particles comprising one L segment and two S segments or two L segments and one S segment. The arenavirus, described herein may be suitable for vaccines and/or treatment of diseases and/or for the use in immunotherapies.

Provided are HBV immunogenic polypeptides, polynucleotides encoding such polypeptides, vectors expressing such immunogenic polypeptides for use in eliciting an immune response against HBV; pharmaceutical and immunogenic compositions and kits comprising such polypeptides, polynucleotides or vectors, and methods of use in treating and/or preventing HBV.

The invention relates to an infectious arenavirus particle that is engineered to contain a genome with the ability to amplify and express its genetic information in infected cells but unable to produce further infectious progeny particles in normal not genetically engineered cells. One or more of the four arenavirus open reading frames glycoprotein (GP), nucleoprotein (NP). matrix protein Z and RNA-dependent RNA polymerase L are removed or mutated to prevent replication in normal cells but still allowing gene expression in arenavirus vector-infected cells, and foreign genes coding for an antigen or other protein of interest or nucleic acids modulating host gene expression are expressed under control of the arenavirus promoters, internal ribosome entry sites or under control of regulatory elements that can be read by the viral RNA-dependent RNA polymerase, cellular RNA polymerase I, RNA polymerise II or RNA polymerase III. The modified arenaviruses are useful as vaccines and therapetitic agents for a variety of diseases.

Disclosed herein are methods and exemplary compositions associated with antigen purification, exemplary aspects of which may include harvesting viral and antigenic substances from source organisms; and a purification platform comprising chemical separation and size-difference separation for the removal of contaminants, debris and impurities from the viral and protein (e.g. antigenic, including influenza hemagglutinin antigens) substances, as well as their concentration and collection.

Provided herein are methods of treating cancer by activating resident memory T cells using one or more antigenic peptides.