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Vet Pathol 45:51-53 (2008)
© 2008 American College of Veterinary Pathologists
BRIEF COMMUNICATIONS AND CASE REPORTS

A Clonal Outbreak of Acute Fatal Hemorrhagic Pneumonia in Intensively Housed (Shelter) Dogs Caused by Streptococcus equi subsp. zooepidemicus

P. A. Pesavento, K. F. Hurley, M. J. Bannasch, S. Artiushin and J. F. Timoney

School of Veterinary Medicine, Department of Pathology, Microbiology, and Immunology (PAP) and Koret Shelter Medicine Program (MJB, KFH), University of California at Davis, Davis, CA, and Gluck Equine Research Center, Department of Veterinary Science, University of Kentucky, Lexington, KY (SA, JFT)

Abstract

An outbreak of acute, fatal, hemorrhagic pneumonia was observed in more than 1,000 mixed breed dogs in a single animal shelter. The Department of Anatomic Pathology at the University of California at Davis School of Veterinary Medicine performed necropsies on dogs that were found moribund in acute respiratory distress or found dead with evidence of nasal bleeding. All dogs had hemothorax and an acute, fibrinosuppurative pneumonia. Large numbers of gram-positive cocci were observed within the lungs of all dogs and within septic thromboemboli of remote organs in about 50% of cases. Bacterial cultures from the dogs and their environment revealed widespread beta-hemolytic Streptococus equi subspecies zooepidemicus (Lancefield Group C). Extensive diagnostic testing failed to reveal the consistent presence of copathogens in individual cases. The clinical, epidemiologic, molecular biologic, and pathologic data indicate that a single clone of S. zooepidemicus was the cause of an acutely fatal respiratory infection in these dogs.

Key words: Canines; pneumonia; respiratory disease; Streptococcus; SzP protein.

Request reprints from Dr. Patricia A. Pesavento, University of California, Davis School of Veterinary Medicine, PMI Room 4206, VM3A One Shields Avenue, Davis, CA 95616-5270 (USA). E-mail: papesavento{at}ucdavis.edu






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