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Studies were undertaken to evaluate the role of complement in the interaction between mycoplasmas and antiserum. A suspension of the A-1 strain ofMycoplasma gallisepticum in PPLO broth was incubated at 37 C with rabbit immune serum which had been heated for 30 min at 56 C. Samples were removed from the mixture at timed intervals for 1 hr for titration of the mycoplasmas in broth. When normal guinea pig serum was included in the mixture at a final dilution of 1:40, the titer fell rapidly from 106 to 102 organisms per 0.2 ml. When the guinea pig serum was heated for 30 min at 56 C or was omitted from the mixture, the immune serum did not reduce the titer. The rate of inactivation was related to the final concentration of antiserum and to the incubation temperature. The effect of the guinea pig serum was eliminated by the addition of 0.01m sodium ethylenediaminetetraacetate or by prior absorption with an unrelated antigen-antibody complex. It was concluded that complement-like substances play an important role in immune inactivation ofM. gallisepticum .

Role of Complement in Immune Inactivation of Mycoplasma gallisepticum