Author's Organization:Hokkaido Branch Laboratory, National Institute of Animal Health:Exotic Disease Research Division, National Institute of Animal Health Hokkaido Branch Laboratory, National Institute of Animal Health Hokkaido Branch Laboratory, National Institute of Animal Health Hokkaido Branch Laboratory, National Institute of Animal Health
Published: February 15, 1990Received: May 15, 1989Available on J-STAGE: February 14, 2008Accepted: October 12, 1989
Advance online publication: -
Revised: -