What are group b streptococci and how are they classified?

See below. Group b strep. Or streptococcus agalactiae is a beta hemolytic streptococcus or chain forming, ball shaped bacteria. They commonly colonize the female genital tract and the colon. Strep. Species that completely hemolyze blood on agar plates are called beta hemolytic. They are subdivided based on presence of various lancefield cell wall antigens. Group b strep. Has the lancefield b antigen.
Complex classificati. Streptococcus is a genus of spherical, gram-positive bacteria of the phylum firmicutes. Streptococcus agalactiae is a gram-positive streptococcus characterized by the presence of group b lancefield antigen, and so takes the name group b streptococcus. The camp test is an important test for identification. Gbs it is characterized by the presence of group b lancefield antigen...Check wikipedia.