Abstract
The possibility that the absence of properdin rather than the presence of toxin in the plasma of shocked animals accounts for the decrease in the phagocytic and bacteriostatic power of phagocytes in vitro was investigated. Properdin (32 units/ml) was added to the in-vitro system containing plasma, phagocytes and bacteria. The functional efficiency of the phagocytes in normal or shock plasma was not altered by the added properdin.

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