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Etiology of outbreaks of pasture fever and milkdrop in Flemish dairy herds

Author
Organization
Abstract
In recent years, outbreaks characterised by fever, tachypnea, milk drop, increased nasal discharge and occasionally redness of the nasal plane and edema of lower limbs or teats, were reported in pastured cattle. The objective of this field study was to investigate the etiology of these outbreaks. Ten acutely affected animals and ten control animals were sampled on eleven affected farms. For all animals, coprology (lungworm), standard hematology and paired serology for Anaplasma phagocytophilum, Mycoplama bovis, Bovine Respiratory Syncytial Virus, ParaInfluenzavirus 3, Bovine Adenovirus 4 (BAV-4), Bovine Viral Diarrhea Virus and Bovine Herpesvirus 1 were performed. Blood from diseased animals was also tested for A. phagocytophilum by PCR. Additionally, cytology, bacterial and viral isolation was performed on broncho-alveolar lavage (BAL) samples of three diseased animals per herd. No lung worms could be detected in any faecal sample. Anaplasma phagocytophilum infection could be confirmed by PCR in four of the outbreaks and was occasionally associated with granulocytopenia. Positive serology for A. phagocytophilum was present in four additional herds. Paired serology showed seroconversion against BAV-4 in two A. phagocytophilum infected herds. Bacteriology of the BAL samples was negative, BAV-4 was isolated from a single BAL sample. Cytology of BAL fluids was indicative for interstitial pneumonia, a possible feature of A. phagocytophilum infection. Remarkably, ticks were detected on the animals in only one herd. In conclusion, A. phagocytophilum was associated with at least four out of eleven outbreaks and only in acutely ill animals PCR or paired serology could confirm A. phagocythophilum infection.
Keywords
Pasture fever, A. phagocytophilum, milk drop, dairy cattle

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Chicago
De Schutter, Peter, Bart Pardon, Koen De Bleecker, Jo Maris, and Piet Deprez. 2011. “Etiology of Outbreaks of Pasture Fever and Milkdrop in Flemish Dairy Herds.” In 6th European Congress of Bovine Health Management : Abstracts, 101–101.
APA
De Schutter, P., Pardon, B., De Bleecker, K., Maris, J., & Deprez, P. (2011). Etiology of outbreaks of pasture fever and milkdrop in Flemish dairy herds. 6th European congress of bovine health management : abstracts (pp. 101–101). Presented at the 6th European congress of Bovine Health Management.
Vancouver
1.
De Schutter P, Pardon B, De Bleecker K, Maris J, Deprez P. Etiology of outbreaks of pasture fever and milkdrop in Flemish dairy herds. 6th European congress of bovine health management : abstracts. 2011. p. 101–101.
MLA
De Schutter, Peter, Bart Pardon, Koen De Bleecker, et al. “Etiology of Outbreaks of Pasture Fever and Milkdrop in Flemish Dairy Herds.” 6th European Congress of Bovine Health Management : Abstracts. 2011. 101–101. Print.
@inproceedings{1899976,
  abstract     = {In recent years, outbreaks characterised by fever, tachypnea, milk drop, increased nasal discharge and occasionally redness of the nasal plane and edema of lower limbs or teats, were reported in pastured cattle. The objective of this field study was to investigate the etiology of these outbreaks. Ten acutely affected animals and ten control animals were sampled on eleven affected farms. For all animals, coprology (lungworm), standard hematology and paired serology for Anaplasma phagocytophilum, Mycoplama bovis, Bovine Respiratory Syncytial Virus, ParaInfluenzavirus 3, Bovine Adenovirus 4 (BAV-4), Bovine Viral Diarrhea Virus and Bovine Herpesvirus 1 were performed. Blood from diseased animals was also tested for A. phagocytophilum by PCR. Additionally, cytology, bacterial and viral isolation was performed on broncho-alveolar lavage (BAL) samples of three diseased animals per herd. No lung worms could be detected in any faecal sample. Anaplasma phagocytophilum infection could be confirmed by PCR in four of the outbreaks and was occasionally  associated with granulocytopenia. Positive serology for A. phagocytophilum was present in four additional herds. Paired serology showed seroconversion against BAV-4 in two A. phagocytophilum infected herds. Bacteriology of  the BAL samples was negative,   BAV-4 was isolated from a single BAL sample. Cytology of BAL fluids was indicative for interstitial pneumonia, a possible feature of A. phagocytophilum infection. Remarkably, ticks were detected on the animals in only one herd. In conclusion, A. phagocytophilum was associated with at least four out of eleven outbreaks and only in acutely ill animals PCR or paired serology could confirm A. phagocythophilum infection.},
  author       = {De Schutter, Peter and Pardon, Bart and De Bleecker, Koen  and Maris, Jo  and Deprez, Piet},
  booktitle    = {6th European congress of bovine health management : abstracts},
  keyword      = {Pasture fever,A. phagocytophilum,milk drop,dairy cattle},
  language     = {eng},
  location     = {Li{\`e}ge, Belgium},
  pages        = {101--101},
  title        = {Etiology of outbreaks of pasture fever and milkdrop in Flemish dairy herds},
  year         = {2011},
}