Mycoplasma bovis and bacterial pathogens in the bovine respiratory tract
2011
Gabinaitiene, A.,Lithuanian Univ. of Health Sciences, Kaunas (Lithuania). Veterinary Academy | Siugzdaite, J.,Lithuanian Univ. of Health Sciences, Kaunas (Lithuania). Veterinary Academy | Zilinskas, H.,Lithuanian Univ. of Health Sciences, Kaunas (Lithuania). Veterinary Academy | Siugzda, R.,Lithuanian Univ. of Health Sciences, Kaunas (Lithuania). Medical Academy | Petkevicius, S.,Lithuanian Univ. of Health Sciences, Kaunas (Lithuania). Veterinary Academy
Bovine respiratory disease caused by Mycoplasma bovis is a major health problem of cattle worldwide. 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. We used the PCR method to identify microorganisms from the Mollicutes class isolated from the nasal cavities. 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 in combination with Pasteurella spp. Mycoplasma bovis in combination with Pasteurella multocida and Mannheimia haemolytica was isolated from 5.7% and 2.9%, resp., of cattle aged 17 months. Pasteurella multocida was common in cattle aged 17 months, Mannheimia haemolytica was isolated from both age groups. 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 less than 0.05). The most common bacterial agents were Pasteurella multocida and Mannheimia haemolytica.
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