Antibiotic susceptibility and biochemical properties of Streptococcus faecalis strains reacting with both D and G...

Thirty one of 60 consecutive isolates of Streptococcus faecalis produced a reaction in both D and G streptococcal grouping sera. A close correlation was found between this grouping reaction and haemolysin production, resistance to erythromycin, tetracycline, and trimethoprim, and delayed fermentation of sorbitol.