[Selective citrate-adonitol medium for the isolation of various strains of Escherichia coli K99].

Simmons citrate agar supplemented with 0.2% adonitol (SCA medium) was used as a differential medium for some enterotoxigenic Escherichia coli: all strains with either a cryptic K99 antigen or a glucose-dependent K99 antigen and 70% of strains with a glucose-independent K99 antigen gave yellow colonies on SCA medium. Other faecal bacteria did not grow or else developed as blue colonies.