Compositions and methods

1. A method of inducing a T-cell mediated immune response against an influenza virus in a subject comprising administering to said subject a composition comprising nucleic acid encoding one or more epitopes of one or more internal proteins of influenza virus, wherein said composition comprises nucleic acid encoding at least two said epitopes, at least one epitope being from each of two or more internal proteins of influenza virus, wherein said nucleic acid is present in a viral vector, wherein said internal proteins comprise nucleoprotein and matrix 1 protein, wherein said epitopes are provided in the form of a nucleoprotein-matrix 1 protein fusion, wherein said internal proteins are from the H3N2 influenza strain subtype A/Panama/2007/99;

wherein said epitopes of the nucleoprotein (NP)-matrix 1 (M1) protein fusion comprise the amino acid sequence of SEQ ID NO: 1;

wherein the method induces T-cell mediated immune response to both nucleoprotein (NP) and matrix 1 protein (M1); and

wherein said viral vector selected from the group consisting of an adenovirus based vector, a MVA based vector, an avipox based vector, an orthopox based vector, and a simian adenovirus based vector.

2. The method of claim 1 , wherein said proteins are arranged in the order N terminus-nucleoprotein-matrix1-protein C terminus.

3. The method of claim 2 , wherein said nucleoprotein and matrix 1 proteins are separated by a linker sequence.

4. The method of claim 3 , wherein said linker sequence has the amino acid sequence GGGPGGG (SEQ ID NO. 3).

5. The method of claim 4 , wherein the coding sequence of the nucleic acid sequence encoding said internal proteins and/or linker polypeptides has been codon optimised for human codon usage.

6. The method of claim 1 , wherein said nucleic acid comprises SEQ ID NO:2.

7. The method of claim 1 , wherein the composition further comprises an adjuvant.