Author's Organization:Department of Hygiene and Microbiology, Faculty of Veterinary Medicine, Hokkaido University Department of Hygiene and Microbiology, Faculty of Veterinary Medicine, Hokkaido University Department of Hygiene and Microbiology, Faculty of Veterinary Medicine, Hokkaido University
Published: December 15, 1988Received: February 18, 1988Available on J-STAGE: February 13, 2008Accepted: August 22, 1988
Advance online publication: -
Revised: -