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Histophilus somni myocarditis and leptomeningitis in feedlot cattle: case report and occurrence in South America.

Authors
  • Margineda, Carlos A1, 2, 3, 4, 5
  • O'Toole, Donal1, 2, 3, 4, 5
  • Prieto, Mónica1, 2, 3, 4, 5
  • Uzal, Francisco A1, 2, 3, 4, 5
  • Zielinski, Gustavo C1, 2, 3, 4, 5
  • 1 Laboratorio de Patología y Bacteriología, Estación Experimental Agropecuaria Marcos Juárez, INTA, Córdoba, Argentina (Margineda, Zielinski). , (Argentina)
  • 2 Enfermedades Infecciosas, Facultad de Ciencias Veterinarias, Universidad Nacional de Rosario, Santa Fe, Argentina (Margineda, Zielinski). , (Argentina)
  • 3 Wyoming State Veterinary Laboratory, Department of Veterinary Sciences, University of Wyoming, Laramie, WY (O'Toole).
  • 4 Laboratorio de Bacteriología Especial, Instituto Nacional de Enfermedades Infecciosas, ANLIS "Dr. Carlos Malbran", Buenos Aires, Argentina (Prieto). , (Argentina)
  • 5 California Animal Health and Food Safety Laboratory, San Bernardino Branch, University of California-Davis, Davis, CA (Uzal).
Type
Published Article
Journal
Journal of veterinary diagnostic investigation : official publication of the American Association of Veterinary Laboratory Diagnosticians, Inc
Publication Date
Nov 01, 2019
Volume
31
Issue
6
Pages
893–898
Identifiers
DOI: 10.1177/1040638719876302
PMID: 31646958
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

We investigated deaths in a group of feedlot steers in Argentina. The main findings in 3 steers autopsied were pulmonary congestion and edema, necrotizing myocarditis, pericarditis, suppurative leptomeningitis, and bronchopneumonia. Histophilus somni was detected by bacterial culture and immunohistochemistry in the hearts of the 3 animals. Partial sequences of the 16S rRNA gene of a H. somni isolate had 99% similarity with other H. somni sequences in GenBank. Most reports of H. somni septicemia in cattle originate from North America and western Europe. There is scant information about cardiac histophilosis in South America. A survey of diagnostic laboratory personnel in 7 South American countries documented various forms of bovine histophilosis in Argentina, Brazil, Uruguay, and Venezuela.

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