Abstract: Provided herein are chimeric hemagglutinin (HA) polypeptides and uses thereof for inducing an immune response (e.g., an antibody response) against influenza virus. Also provided herein are methods of generating antibodies to the chimeric HA polypeptides in a subject.

Abstract: Described herein are recombinant Newcastle disease viruses (“NDVs”) comprising a packaged genome, wherein the packaged genome comprises a transgene comprising a nucleotid sequence encoding a SARS-CoV-2 spike protein or nucleocapsid protein. Also described herein are recombinant NDVs comprising a packaged genome, wherein the packaged genome comprises a transgene encoding a chimeric F protein, wherein the chimeric F protein comprises a SARS-CoV-2 spike protein ectodomain and NDV F protein transmembrane and cytoplasmic domains. The recombinant NDVs and compositions thereof are useful for the immunizing against SARS-CoV-2 as well as the prevention of COVID-19.

Abstract: An active or inactivated recombinant vaccine against COVID-19 is described that comprises a Newcastle disease viral vector and a pharmaceutically acceptable carrier, adjuvant and/or excipient, characterized in that the viral vector is a virus capable of generating a cellular immune response that has a SARS-CoV-2 exogenous nucleotide sequence inserted,

Abstract: The present invention relates to compositions and methods for inducing an immune response against influenza virus in a subject. In some embodiments, the present invention provides a composition comprising a nucleoside-modified nucleic acid molecule encoding at least one influenza virus antigen, such as a hemagglutinin antigen or a fragment thereof, neuraminidase antigen or a fragment thereof, nucleoprotein antigen or a fragment thereof, matrix protein 1 antigen or a fragment thereof, or matrix-2 ion channel antigen or a fragment thereof.

Abstract: In one aspect, provided herein are recombinant neuraminidases comprising an ectodomain of influenza virus neuraminidase with amino acid substitutions or insertions of cysteines in the stalk domain to generate a more stable, tetrameric influenza virus neuraminidase. In specific embodiments, the influenza virus neuraminidase further comprises influenza virus neuraminidase transmembrane and cytoplasmic domains. In another aspect, provided herein are recombinant neuraminidase comprising a globular head domain of influenza virus neuraminidase and a tetramerization domain, wherein the recombinant neuraminidase lacks influenza virus neuraminidase stalk, transmembrane and cytoplasmic domains. In another aspect, provided herein are methods of immunizing against influenza virus using such recombinant neuraminidases or compositions thereof.

Abstract: Provided herein are antibodies that bind to neuraminidase (NA) of different strains of influenza B virus, host cells for producing such antibodies, and kits comprising such antibodies. Also provided herein are compositions comprising antibodies that bind to NA of different strains of influenza B virus and methods of using such antibodies to diagnose, prevent or treat influenza virus disease.

Abstract: Provided herein are chimeric hemagglutinin (HA) polypeptides and uses thereof for inducing an immune response (e.g., an antibody response) against influenza virus. Also provided herein are methods of generating antibodies to the chimeric HA polypeptides in a subject.

Abstract: In one aspect, provided herein are mutated influenza virus neuraminidase polypeptides, wherein the mutated influenza virus neuraminidase polypeptides comprise a first cytoplasmic domain, a first transmembrane domain, a first stalk domain, and a first globular head domain of a first neuraminidase of a first influenza virus with an insertion of 15 to 45 or 1 to 50 amino acid residues in the first stalk domain of the first neuraminidase. In another aspect, provided herein is an influenza virus comprising such a mutated influenza virus neuraminidase polypeptide, a genome comprising a nucleotide sequence encoding such a mutated influenza virus neuraminidase polypeptide or both. In another aspect, provided herein is an immunogenic composition comprising such an influenza virus, and optionally an adjuvant.

Abstract: The present invention relates to antibodies against influenza neuraminidase, compositions containing the antibodies and methods of using the antibodies.

Abstract: Provided herein are antibodies that bind to neuraminidase (NA) of different strains of influenza B virus, host cells for producing such antibodies, and kits comprising such antibodies. Also provided herein are compositions comprising antibodies that bind to NA of different strains of influenza B virus and methods of using such antibodies to diagnose, prevent or treat influenza virus disease.

Abstract: Provided herein are chimeric hemagglutinin (HA) polypeptides and uses thereof for inducing an immune response (e.g., an antibody response) against influenza virus. Also provided herein are methods of generating antibodies to the chimeric HA polypeptides in a subject.

Abstract: Provided herein are antibodies that bind to neuraminidase (NA) of different strains of influenza B virus, host cells for producing such antibodies, and kits comprising such antibodies. Also provided herein are compositions comprising antibodies that bind to NA of different strains of influenza B virus and methods of using such antibodies to diagnose, prevent or treat influenza virus disease.

Abstract: In one aspect, provided herein is a mosaic influenza virus hemagglutinin (HA) polypeptide comprising an influenza A virus HA ectodomain of an influenza A virus strain HA, wherein the HA ectodomain comprises an HA stem domain of the influenza A virus strain HA and an HA globular head domain of the influenza A virus strain HA, wherein the HA globular head domain of the influenza A virus strain HA has been engineered to comprise one or more amino acid substitutions in one, two, three, four or all of the antigenic sites. In another aspect, provided herein are immunogenic compositions comprising such a mosaic influenza virus HA polypeptide or an influenza A virus comprising such a mosaic influenza virus HA polypeptide. In yet another aspect, provided herein are methods for immunizing a subject against an influenza A vims in a subject comprising administering such an immunogenic composition to the subject.

Abstract: Provided herein are immunization regimens for inducing an immune response (e.g., an antibody response) against influenza virus. In specific aspects, the immunization regimens involve the administration of a chimeric hemagglutinin (HA), a headless HA or another influenza virus stem domain based construct (e.g., the HA stem domain or a fragment thereof) to a subject. In certain aspects, the immunization regimens also involve the administration of an influenza virus neuraminidase immunogen.

Abstract: Provided herein are antibodies that bind to neuraminidase (NA) of different strains of influenza B virus, host cells for producing such antibodies, and kits comprising such antibodies. Also provided herein are compositions comprising antibodies that bind to NA of different strains of influenza B virus and methods of using such antibodies to diagnose, prevent or treat influenza virus disease.

Abstract: Provided herein are chimeric influenza hemagglutinin (HA) polypeptides, compositions comprising the same, vaccines comprising the same, and methods of their use.

Abstract: Provided herein are chimeric hemagglutinin (HA) polypeptides and uses thereof for inducing an immune response (e.g., an antibody response) against influenza virus. Also provided herein are methods of generating antibodies to the chimeric HA polypeptides in a subject.

Abstract: Provided herein are immunization regimens for inducing an immune response (e.g., and antibody response) against influenza virus. In specific aspects, the immunization regimens involve the administration of a chimeric hemagglutinin (HA), a headless HA or another influenza virus stem domain based construct (e.g., the HA stem domain or a fragment thereof) to a subject. In certain aspects, the immunization regimens also involve the administration of an influenza virus neuraminidase immunogen. Also provided herein are immunogenic/vaccine compositions for use in methods of immunizing or immunization regimens for human subjects against influenza virus.

Abstract: Provided herein are flu hemagglutinin polypeptides, including chimeric influenza virus hemagglutinin polypeptides, and flu hemagglutinin polypeptides comprising modified glycosylation sites and non-naturally glycosylation sites, compositions comprising the same, vaccines comprising the same and methods of their use.

Abstract: Provided herein are chimeric influenza hemagglutinin (HA) polypeptides, compositions comprising the same, vaccines comprising the same, and methods of their use.