The present specification discloses recombinant nucleic acid constructs encoding an immunogenic multiepitope polypeptide comprising two or more polypeptides, recombinant nucleic acid constructs encoding at least two epitopes from two or more internal proteins of influenza virus, compositions comprising such recombinant nucleic acid constructs and methods of eliciting a T cell immune response against an influenza virus in a vertebrate using such recombinant nucleic acid constructs and compositions.

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 are compositions and methods related to mutant viruses, and in particular, mutant influenza viruses. The mutant viruses disclosed herein include mutant M2 sequences, mutant BM2 sequences, and are useful in immunogenic compositions, e.g., as a quadrivalent vaccines. Also disclosed herein are methods, compositions and cells for propagating the viral mutants, and methods, devices and compositions related to vaccination.

The present application discloses an immunogenic composition comprising N. meningitidis capsular polysaccharides from at least one of serogroups A, C, W135 and Y conjugated to a carrier protein to produce a N. meningitidis capsular polysaccharide conjugate, wherein the average size of each N. meningitidis polysaccharide is above 50 kDa.

Disclosed herein are compositions and methods related to mutant viruses, and in particular, mutant influenza viruses. The mutant viruses disclosed herein include mutant M2 sequences, mutant BM2 sequences, and are useful in immunogenic compositions, e.g., as a quadrivalent vaccines. Also disclosed herein are methods, compositions and cells for propagating the viral mutants, and methods, devices and compositions related to vaccination.

A method of producing a virus like particle (VLP) in a plant comprising modified H3 hemagglutinin is provided. The method comprises introducing a nucleic acid comprising a regulatory region active in the plant and operatively linked to a nucleotide sequence encoding a modified influenza hemagglutinin (HA) protein into the plant, or portion of the plant, the modified HA protein comprises a modified proteolytic loop. Followed by incubating the plant or portion of the plant under conditions that permit the expression of the nucleic acids, thereby producing the VLP. The modified proteolytic loop may comprise one or more protease cleavage sites exhibiting reduced or abolished cleavage by a protease. Also described is a virus like particle (VLP) produced by the method, and plants expressing the VLP. The virus like particle (VLP) may comprise plant-specific N-glycans, or modified N-glycans.

The present invention provides, among other things, a novel and improved method for generating “mosaic” influenza antigenic polypeptides including hemagglutinin (HA) and neuraminidase (NA) polypeptides based on unique combination of epitope patterns that maximize exposure to epitopes present across multiple HA or NA sequences and therefore improved influenza strain coverage. In particular, the present invention provides engineered H1N1 influenza hemagglutinin (HA) polypeptides that are comprised of novel combinations of protective epitopes and antigenic regions from multiple H1N1 viral strains. Such engineered HA polypeptides have improved properties over HA polypeptides developed through conventional approaches that rely on consensus alignments of viral sequences.

The present specification discloses recombinant nucleic acid constructs encoding an immunogenic multiepitope polypeptide comprising two or more polypeptides, recombinant nucleic acid constructs encoding at least two epitopes from two or more internal proteins of influenza virus, compositions comprising such recombinant nucleic acid constructs and methods of eliciting a T cell immune response against an influenza virus in a vertebrate using such recombinant nucleic acid constructs and compositions.

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.

Compositions and methods for the treatment of viral infections include conjugates containing inhibitors of viral neuraminidase (e.g., zanamivir, peramivir, or analogs thereof) linked to an Fc monomer, an Fc domain, and Fc-binding peptide, an albumin protein, or albumin-binding peptide. In particular, conjugates can be used in the treatment of viral infections (e.g., influenza viral infections).