Multivalent combination vaccines are provided which include an immunological agent effective for reducing the incidence of or lessening the severity of M. hyo infection, preferably M. hyo bacterin, or an immunogenic composition comprising M. hyo bacterin, and at least one immunogenic active component of another disease-causing organism in swine, preferably PCV2 wherein the preferred PCV2 antigen for such a multivalent vaccine is PCV2 ORF 2 protein.
