<prompt> The commonest organism causing cellulitis isStreptococcus pyogenesStreptococcus faecalisStreptococcus viridansMicroaerophilic streptococci  <response>: Streptococcus pyogenes causes a variety of suppurative infection of the skin, including infection of the wound or burns, with a predilection to produce cellulitis and lymphangitis. Streptococcal subcutaneous infection ranges from cellulitis to Necrotising fasciitis. Reference: Textbook of Microbiology; Anathanarayan and panikers; 10th edition; Page no: 215 