Author's Organization:Poultry Disease Laboratory, National Institute of Animal Health Poultry Disease Laboratory, National Institute of Animal Health Poultry Disease Laboratory, National Institute of Animal Health Poultry Disease Laboratory, National Institute of Animal Health Poultry Disease Laboratory, National Institute of Animal Health Poultry Disease Laboratory, National Institute of Animal Health Poultry Disease Laboratory, National Institute of Animal Health
Published: February 15, 1992Received: July 29, 1991Available on J-STAGE: February 15, 2008Accepted: September 14, 1991
Advance online publication: -
Revised: -