Attenuated live or replication-deficient chimeric swine influenza virus vaccine, and a platform to develop a multitude of other vaccines in swine and other species. The chimeric influenza virus A comprises a backbone of viral genomic segments derived from influenza A, and expresses a heterologous surface protein (influenza D hemagglutinin esterase fusion protein), and optionally at least one other heterologous protein, such as an antigenic component of a target pathogen.
