<prompt> Streptococcus all are true except-Streptodornase cleaves DNAStreptolysis 0 is active in reduced stateStreptokinase is produced from serotype A,C,KPyrogenic toxin A is plasmid mediated  <response>: Ans. is d i.e., Pyrogenic toxin A is plasmid mediated Three toxin types of streptococcal pyroexotoxin have been identified : A, B and C. Type A and C are coded for bacteriophage genes, while type B gene is chromosomal. Streptolysin 0 is oxygen labile; therefore, it is active in reduced state only Streptokinase is also known as fibrinolysin. It is expressed on all strains of streptococcus pyogenes including A,C,K. It is expressed close to plasminogen binding site on the bacterial surface, it is activated to plasmin by streptokinase. Deoxyribonucleases streptodornases hydrolyze nucleic acids e.g. DNA. 