Pathogenicity of a caprine strain of Mycoplasma mycoides subsp. mycoides for cattle

The caprine strain (Ib9) of M. mycoides, given by endobronchial inoculation, is capable in inducing infection in calves. Typical CBPP lesions were produced in imported breeds when they were simultaneously infected with a mouse passaged strain of T. vivax. Mycoplasma persisted in the regional lymph nodes of 4 of the 5 infected animals which failed to develop lung lesions. In these animals the caprine strain might behave like a vaccine strain. Further studies are required as to the pathogenicity and immunogenicity of the caprine strain of M. mycoides for cattle.