| 摘要 |
A strain of Mycoplasma which is a causative agent of bovine pneumonias, whic h has been inactivated by treatment with an agent, which disrupts cel membrane s such as saponin, is described. Preferably, the strain is Mycoplasma bovis or Mycoplasma mycoides subsp.mycoides SC. These strains can be used as vaccines . Veterinary compositions, methods of preparing these and their use in prophylaxis is also described and claimed.
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