Human metapneumovirus viral vector-based vaccines

4-6. (canceled)

8-13. (canceled)

A viral vector that encodes an hMPV F polypeptide antigen, wherein said F polypeptide lacks a transmembrane domain, lacks a cytoplasmic tail, and comprises an amino acid substitution replacing threonine at amino acid position 160 of SEQ ID NO:

• 1, and an amino acid substitution replacing asparagine at amino acid position 46 of SEQ ID NO:
• 1.

17-24. (canceled)

(canceled)

A viral vector encoding an hMPV F polypeptide, wherein said F polypeptide comprises at least 95% sequence identity to SEQ ID NO:

• 7.

31-38. (canceled)

40-41. (canceled)

44-49. (canceled)

52-53. (canceled)