Use of the Clumping Factor Reaction for the Identification of Encapsulated Strains of Staphylococcus aureus from Human Sources

Abstract
Using the clumping factor test on 815 strains of Staphylococcus aureus , 775 positive strains were of compact morphology. Of 40 negative strains, 39 were diffuse in serum-soft agar. The test may be used to detect capsulated S. aureus strains.