Multiple choice The spreading factor responsible for Streptococci infection is: streptokinase muramic acid deoxyribonuclease C peptidoglycan none of the above Reveal answer Fill a bubble to check yourself C Correct answer Explanation Deoxyribosenuclease 3 is an extracellular enzyme produced by Streptococci [Gr.p A]. It is spreading factor, an important enzyme in skin and soft tissue infection.