US Patent 11007262 Vaccines comprising mutant attenuated influenza viruses

The invention provides a vaccine comprising an effective amount of an isolated recombinant influenza virus comprising a mutant M gene segment that is mutated so that upon viral replication the mutant M gene expresses a functional M1 protein and a mutant M2 protein with a deletion of the cytoplasmic tail and either lacking a transmembrane domain or having a mutated transmembrane domain.