Abstract: Methods of generating influenza B viruses that include a plurality of residues in HA that are specific for the Yamagata or Victoria lineage of influenza B viruses, and recombinant viruses having a plurality of residues in HA that are specific for the Yamagata lineage and for the Victoria lineage of influenza B viruses.

Abstract: The invention provides a recombinant biologically contained influenza virus that is a PB2 knockout virus, e.g., one that is useful to generate a multivalent vaccine, and methods of making and using that virus.

Abstract: A nanoparticle that displays a coronavirus spike protein or a portion thereof on its surface, and methods of making and using the nanoparticle, are provided.

Abstract: An isolated recombinant influenza virus is provided having PA, PB1, PB2, NP, NS, M, NA and HA viral segments, wherein the PB1 viral segment encodes a PB1 with a residue other than isoleucine at position 711 or the M viral segment encodes a M1 with a residue other than methionine at position 128, wherein the recombinant influenza virus has enhanced replication relative to a corresponding influenza virus having a PB1 viral segment that encodes a PB1 with an isoleucine at position 711 or having a M viral segment that encodes a M1 with methionine at position 128, as well as methods of making and using the virus.

Abstract: Methods of preparing influenza viruses having altered immunodominant epitopes in HA, e.g., having one or more residues in one or more of antigenic sites A-E in HA altered, and viral vectors, e.g., influenza virus VLPs or non-influenza viruses or VLPs thereof expressing or having influenza HAs with altered immunogenicity as a result of altered immunodominant epitopes therein are provided.

Abstract: Methods of preparing influenza viruses having altered immunodominant epitopes in HA, e.g., having one or more residues in one or more of antigenic sites A-E in HA altered, and viral vectors, e.g., influenza virus VLPs or non-influenza viruses or VLPs thereof expressing or having influenza HAs with altered immunogenicity as a result of altered immunodominant epitopes therein are provided.

Abstract: An isolated recombinant influenza virus is provided having PA, PB1, PB2, NP, NS, M, NA and HA viral segments, wherein the PB1 viral segment encodes a PB1 with a residue other than isoleucine at position 711 or the M viral segment encodes a M1 with a residue other than methionine at position 128, wherein the recombinant influenza virus has enhanced replication relative to a corresponding influenza virus having a PB1 viral segment that encodes a PB1 with an isoleucine at position 711 or having a M viral segment that encodes a M1 with methionine at position 128, as well as methods of making and using the virus.

Abstract: The invention provides a recombinant biologically contained influenza virus that is a PB2 knockout virus, e.g., one that is useful to generate a multivalent vaccine, and methods of making and using that virus.

Abstract: The invention provides a composition useful to prepare high titer influenza B viruses, e.g., in the absence of helper virus, which includes internal genes from an influenza B virus vaccine strain or isolate, e.g., one that is safe in humans, for instance, one that does not result in significant disease, that confer enhanced growth in cells in culture, such as MDCK cells, or in eggs.

Abstract: The invention provides a composition useful to prepare high titer influenza B viruses, e.g., in the absence of helper virus, which includes internal genes from an influenza B virus vaccine strain or isolate, e.g., one that is safe in humans, for instance, one that does not result in significant disease, that confer enhanced growth in cells in culture, such as MDCK cells, or in eggs.

Abstract: Compositions and methods to prepare influenza virus-like particles (VLPs) are provided.

Abstract: The invention provides a composition useful to prepare influenza vaccine viruses, e.g., in the absence of helper virus, which includes internal viral segments from an influenza virus vaccine strain or isolate, e.g., one that is safe in humans, for instance, one that does not result in significant disease, and encodes a heterologous antigen.

Abstract: An isolated recombinant influenza virus is provided having PA, PB1, PB2, NP, NS, M, NA and HA viral segments, wherein the PB1 viral segment encodes a PB1 with a residue other than isoleucine at position 711 or the M viral segment encodes a M1 with a residue other than methionine at position 128, wherein the recombinant influenza virus has enhanced replication relative to a corresponding influenza virus having a PB1 viral segment that encodes a PB1 with an isoleucine at position 711 or having a M viral segment that encodes a M1 with methionine at position 128, as well as methods of making and using the virus.

Abstract: Compositions and methods to prepare influenza virus-like particles (VLPs) are provided.

Abstract: The invention provides a recombinant biologically contained influenza virus that is a PB2 knockout virus, e.g., one that is useful to generate a multivalent vaccine, and methods of making and using that virus.

Abstract: Methods of preparing influenza viruses having altered immunodominant epitopes in HA, e.g., having one or more residues in one or more of antigenic sites A-E in HA altered, and viral vectors, e.g., influenza virus VLPs or non-influenza viruses or VLPs thereof expressing or having influenza HAs with altered immunogenicity as a result of altered immunodominant epitopes therein are provided.

Abstract: A vector, composition and method to improve influenza virus replication by inhibiting miRNA lec-7C binding to influenza virus mRNA and/or cRNA.

Abstract: The invention provides a recombinant biologically contained influenza virus that is a PB2 knockout virus, e.g., one that is useful to generate a multivalent vaccine, and methods of making and using that virus.

Abstract: Compositions and methods to prepare influenza virus-like particles (VLPs) are provided.

Abstract: The invention provides a composition useful to prepare influenza viruses, e.g., in the absence of helper virus, using vectors which include tandem transcription cassettes containing PolI and/or PolII promoters.