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SUMMARY Normal rabbit sera contain a factor that, in conjunction with a heat labile component of guinea-pig or foetal calf serum, prevented the growth of human and other T-mycoplasmas but had little or no effect on bovine T-mycoplasmas examined. Susceptibility of human strains to the action of this substance was altered by growth in different media. The possibility that the factor might be antibody is discussed.

Inhibition by Normal Rabbit Sera of the Growth of T-mycoplasma Strains Isolated from Different Animal Species