Antibody formation in laboratory animals after parenteral application of A/swine influenza virus.

Antigenicity of swine influenza viruses, Ann Arbor/31 and recombinant X-53, was compared on the different animal species. The serological investigations of animals infected with live or immunized with the inactivated virus, demonstrated a close antigenic relationship between the H and N antigens of both viruses. For inactivated vaccine preparation it was recommended, on the basis of our results, to use Ann Arbor virus instead of virus X-53.