Author's Organization:Morioka Livestock Hygiene Service Center Saikinkagaku Institute Co. National Institute of Animal Health Kitasato University Saikinkagaku Institute Co.
Published: December 15, 1990Received: June 06, 1989Available on J-STAGE: February 14, 2008Accepted: July 23, 1990
Advance online publication: -
Revised: -