<prompt> Scarlet fever is caused due to?StreptococciStaphylococKlebsiellaProteus  <response>: Ans. is a i.e., Streptococci Infections caused by streptococcus pvogenes 1 Respiratory infections . Sore throat is the most common of streptocococcal disease . It may be localised as tonsillitis as in older children and adults or it may involve the pharynx more diffusely pharyngitis as in younger children. Otitis media . Mastoiditis . Quincy . Ludwigs angina . Suppurative adenitis . Pneumonia as a complication of influenza or other respiratory viral disease. 2 Skin and soft tissue infections . Erysipelas - Diffuse infection involving the superficial lymphatics. - Occurs in older patients. . Impetigo - Superficial infection of skin Pyoderma- Occurs in young patients - Usually involves face and leg. . Cellulitis . Lymphangitis 3 Deep soft tissue infections . Necrotizing fascitis hemolytic streptococcal gangrene Myositis - Most common organism causing myositis is S. aureus 4 Abscesses - in brain, lungs, liver, and kidney. 5 Scarlet fever . Consists of pharyngitis, accompanied by a characteristic rash. . Caused by production of erythrogenic toxin. 6 Puerperal sepsis . More often caused by group B streptococci. 7 Bacteremia 8 Streptococcal toxic shock syndrome Str. Pyogenes strains M type 1 and 3 forming pyrogenic exotoxin A are responsible. . These strains also known as flesh eating bacteria. 9 Nonsuppurative complications . Acute Rheumatic fever - Follows persistent or repeated streptococcal throat infections not skin infection. . Glomerulonephritis - May occur after throat or skin infection perhaps, in the tropics skin infections are more impoant than throat infections. 