Abstract
A compact-colony-forming active substance (CCFAS) was extracted from a strain of Staphylococcus epidermidis. It showed similar biological activity and reacted with a serumreacting factor to CCFAS obtained from strains of S. aureus.
With these substances, however, serological heterogeneity was demonstrated by the agar diffusion test. Biological examination revealed that CCFAS obtained from the strain of S. epidermidis contained glycerol, while this substance from strains of S. aureus contained ribitol.
