All are medically important streptococci except -
STREPTOCOCCI 

Streptococci are gram-positive, nonmotile, non-spore-forming, catalase & oxidase negative medically important bacteria.
Many organisms of streptococcus genus cause human diseases.
Strep. pyogenes
Strep. agalactiae
Strep. equisimilis
Strep. salivarius