Immunohistochemical study of Hemophilus somnus, Mycoplasma bovis, Mannheimia hemolytica, and bovine viral diarrhea virus in death losses due to myocarditis in feedlot cattle

The purpose of this study was to determine the presence of Hemophilus somnus, Mycoplasma bovis, Mannheimia hemolytica, and bovine viral diarrhea virus (BVDV) in lesional tissues of feeder calves dying with myocarditis. Tissues from the heart and lungs of 92 calves dying with myocarditis in Alberta f...

Full description

Saved in:
Bibliographic Details
Published in:Canadian veterinary journal 2004-03, Vol.45 (3), p.231-234
Main Authors: Haines, Deborah M, Moline, Karen M, Sargent, Ron A, Campbell, John R, Myers, Douglas J, Doig, Paul A
Format: Article
Language:English
Subjects:
Alberta - epidemiology
Analysis of Variance
Animals
Antigens, Bacterial - analysis
Antigens, Viral - analysis
Cattle
Cattle Diseases - microbiology
Cattle Diseases - mortality
Cattle Diseases - virology
Diarrhea Viruses, Bovine Viral - immunology
Diarrhea Viruses, Bovine Viral - isolation & purification
Haemophilus somnus - immunology
Haemophilus somnus - isolation & purification
Immunohistochemistry - methods
Immunohistochemistry - veterinary
Mannheimia haemolytica - immunology
Mannheimia haemolytica - isolation & purification
Mycoplasma bovis - immunology
Mycoplasma bovis - isolation & purification
Myocarditis - microbiology
Myocarditis - mortality
Myocarditis - veterinary
Myocarditis - virology
Scientific
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The purpose of this study was to determine the presence of Hemophilus somnus, Mycoplasma bovis, Mannheimia hemolytica, and bovine viral diarrhea virus (BVDV) in lesional tissues of feeder calves dying with myocarditis. Tissues from the heart and lungs of 92 calves dying with myocarditis in Alberta feedlots were immunohistochemically stained for the antigens of these agents. Tissues from 44 calves dying from noninfectious causes and 35 calves dying with pneumonia were tested as controls. Hemophilus somnus was found in cardiac lesions in the majority of myocarditis cases (70/92). Mycoplasma bovis was concurrently demonstrated in the hearts of 4/92 affected calves. No bacterial pathogens were found in heart tissues from the control groups of calves. Bovine viral diarrhea virus was demonstrated in the tissues of 4/92 myocarditis cases compared with those of 13/35 calves dying from pneumonia and 0/44 calves dying from noninfectious causes. The results demonstrate that H. somnus is the principle pathogen associated with myocarditis in feedlot calves and that the presence of BVDV is more common in these calves compared with calves dying of noninfectious causes. The findings also suggest that BVDV is an important pathogen in calves dying with gross postmortem lesions of pneumonia.
ISSN:0008-5286