Abstract
Extracts of sonically disrupted Mycoplasma mycoides and Escherichia coli were fractionated by sucrose density gradient centrifugation. The presence of antigen in each of the fractions was determined by complement-fixation and agar-gel diffusion precipitin tests, in which cow, pig, and rabbit anti-M. mycoides sera and rabbit anti-E. coli serum were used. Fractions of M. mycoides, with a buoyant density of 1.225 or lower, fixed complement with cow and pig anti-M. mycoides sera. These fractions also formed precipitin lines with pig antiserum. Fractions in the buoyant density range of 1.10 to 1.20 fixed complement with rabbit anti-E. coli serum, but precipitin lines were not formed. All E. coli fractions fixed complement and gave precipitin lines with homologous serum. But fractions in the buoyant density range of 1.10 to 1.20 had minimal complement fixation with heterologous M. mycoides sera. The cross-reacting antigens in M. mycoides and E. coli had a buoyant density of 1.10 to 1.20; the specific antigens were isolated from M. mycoides at a buoyant density of 1.08 to 1.02.
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