Influenza A virus with attenuating mutations in NS2 protein

摘要

The invention provides an isolated attenuated recombinant influenza virus comprising a gene segment comprising a mutant NS2 protein gene, wherein the NS2 protein has at least two substitutions that do not substantially alter the in vitro replication of the virus but are associated with attenuation of the virus in vivo, wherein at least one of the substitutions is a substitution for glutamate.