Can any doc tell me what's streptococcus bacteria?

See Below. Streptococcus is a Genus of bacteria that are round in shape and form chains. They stain Gram positive or dark purple on Gram stain. There are many different species of Streptococcus such as S. pyogenes, the cause of Strep throat and the flesh eating bug or necrotizing fasciitis. Strep pneumoniae is a common cause of pneumonia. Different species of Strep colonize the mouth, intestine and vagina.