An attenuated swine influenza strain capable of providing a safe and effective immune response in a porcine animal against a virulent H3N2 swine influenza or diseases caused by H3N2 swine influenza wherein the attenuated strain encodes an HA protein having five additional glycosylation sites, relative to its corresponding virulent parental strain wherein the virulent parental strain encodes an HA protein having the polypeptide sequence as set forth in SEQ ID NO: 18 and wherein the five glycosylation sites are S71N, K90N, L173T, P287T, and K294T.
