<prompt> Griffith typing is done forStaphylococcusStreptococcusMeningococcusGonococcus  <response>: Griffith typing is used for fuher classification of S.pyogenes, belonging to Lancefields group A. Based on the M proteins on the cell surface, they are subdivided into M types. About 80 types of Streptococcus pyogenes have been recognized so far types M1, M2, M3 and so on. Ref: Textbook of microbiology; Ananthanarayan and panikers; 10th Edition; Pg: 211 