OCCURRENCE OF STREPTOCOCCI THAT GIVE A FALSE-POSITIVE COAGULASE TEST

Abstract
Strains of enterococci that are able to ferment citrate may cause clotting of citrated plasma. However, this reaction always takes longer than 3 hrs., whereas active cultures of coagulase-positive staphylococci cause clotting in 1-2 hrs. These enterococci will not clot plasma that contains other anticoagulants such as oxalate, fluoride, or heparin.

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