Abstract
1 Department of Population Health and Reproduction, University of California School of Veterinary Medicine, Davis, California 95616
2 Mycoplasma Section, Frederick Cancer Research and Development Center, National Institute of Allergy and Infectious Diseases, Frederick, Maryland 21702
3 Respiratory and Systemic Infections Laboratory and National Collection of Type Cultures, Central Public Health Laboratory, London NW9 5HT, England
4 Animal Health Research Laboratory, CSIRO Division of Animal Health, Parkville, Victoria 3052, Australia