Abstract
Summary
Bovine alpha-globulin (bovine plasma fraction IV, Armour) in the presence of guinea pig complement inhibits the growth of the pleuropneumonia-like organisms. Heat-inactivated bovine serum is slightly inhibitory but the alpha-, beta-, and gamma-globulins are non-inhibitory in the absence of complement. Complement by itself does not inhibit growth as extensively as when in the presence of globulin. Alpha-globulin in the presence of the organisms fixes complement in low titer.
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