a selective medium was developed on which both major subgroups of strep . mutans ( c/e/f and d/g ) can be cultured and recognized on the basis of colonial morphology , trypticase , yeast , cystine ( tyc ) agar was modified by adding separately autoclaved sucrose to a final concentration of 20 per cent and 0.1 unit/ml bacitracin ( tycsb ) .
C0038395
strep
C0004599
bacitracin