Many tests have been used to distinguish pathogenic from non-pathogenic staphylocooci ; the most useful, now generally acccpted, is the demonstration of coagulase. The coagulation of plasma by certain staphylococci was origina.lly described by Much (1908) and has been developed by many workers (Cruickshank, 1937 ; Fairbrother, 1940 ; and others). Recently Cadness-Graves et al. (1943) found that the clumping of staphylococci in plasma as determined by slide tests was roughly parallel to coagulase productio…
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