Vet Med - Czech, 2011, 56(1):29-35 | DOI: 10.17221/1572-VETMED

Mycoplasma bovis and bacterial pathogens in the bovine respiratory tract

A. Gabinaitiene1, J. Siugzdaite1, H. Zilinskas1, R. Siugzda2, S. Petkevicius1
1 Lithuanian Health Science University, Veterinary Academy, Kaunas, Lithuania
2 Lithuanian Health Science University, Medical Academy, Kaunas, Lithuania

Bovine respiratory disease caused by Mycoplasma bovis is a major health problem of cattle worldwide. It inflicts considerable financial losses on beef herds and is the most common cause of mortality in dairy cattle. Bacteriological examination of 35 nasal cavity samples from calves younger than three months of age identified Mycoplasma bovis in eight (22.9%) samples. These cattle were followed until 17 months of age, and repeated examination of nasal cavity samples before necropsy identified Mycoplasma bovis in four (11.4%) samples. At necropsy and lung samples for bacteriological and histological examination were collected. To identify microorganisms from the Mollicutes class isolated from the nasal cavities of cattle we used the PCR method. Furthermore, Mycoplasma bovis was identified on the grounds of biochemical characteristics and by the disk growth inhibition test. The organism was found in 5.7% of calves younger than three months of age in combination with Pasteurella spp. Mycoplasma bovis in combination with Pasteurella multocida and Mannheimia haemolytica was isolated from 5.7% and 2.9% of cattle at 17 months. However, Pasteurella multocida was common in cattle at 17 months and Mannheimia haemolytica was isolated from both age groups of cattle. Histopathological examination of lung samples revealed broncho-interstitial pneumonia in 14.3% of samples. Mycoplasma bovis was isolated from 60.0% of broncho-insterstitial pneumonia cases. The organism was isolated more frequently from the group of calves rather than from the cattle group (P < 0.05). The most common bacterial agents were Pasteurella multocida and Mannheimia haemolytica.

Keywords: cattle; bacteria; mycoplasma; respiratory tract

Published: January 31, 2011  Show citation

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Gabinaitiene A, Siugzdaite J, Zilinskas H, Siugzda R, Petkevicius S. Mycoplasma bovis and bacterial pathogens in the bovine respiratory tract. Vet Med - Czech. 2011;56(1):29-35. doi: 10.17221/1572-VETMED.
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