The clumping of Staphylococcus pyogenes by serum and fibrinogen-free plasmas

Abstract
Fifty strains of Staphylococcus pyogenes were tested for `coagulase' by the slide method using plasma, serum, and plasmas rendered fibrinogen-free by various methods. It was found that the organisms were clumped by all these reagents. The significance of these findings is discussed.

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