Abstract
SUMMARY Complement-fixation tests were used to compare strains of Mycoplasma mycoides var. mycoides (5 strains), M. mycoides var. Capri (5 strains) and M. laidlawii of bovine genital origin (3 strains). Strains of M. mycoidesand M. Capri showed cross-reactions of about 25% identity, but strains of M. Zaidlawii appeared to be antigenically distinct. The results, measured in terms of the amounts of complement fixed, are shown graphically and discussed in relation to the diagnosis of contagious bovine pleuropneumonia.

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