<- NCTC <- D. Thomson (Streptococcus mitis). Pyorrhoea. Taxonomy/description (3345, 3969). Murein: A11.5 (3345). Quality control strain according to DIN 58959-7; listed herein as Streptococcus mitis (6924). (Medium 693, 37°C, microaerophilic or Medium 92, 37°C, microaerophilic).