NCIt definition : A bacterium that is assigned to the genus Streptococcus that is incapable of supporting
its own growth on standard culture plates but can sustain growth using substances
released into the medium by the dominant colonies. These Streptococci require L-cysteine
for growth. They have been identified as an etiologic agent of endocarditis and other
infections.;
Alternative definition : CDISC: Any bacterial organism that can be assigned to a nutritionally variant group
in the genus Streptococcus.;