Group A hemolytic pharyngitis is due to?

Local infection REF: Jawett's 24th edition, chapter 15 Classification of streptococcal infections: Diseases Attributable to Invasion by S pyogenes, Hemolytic Group A Streptococci Erysipelas Cellulitis Necrotizing Fasciitis (Streptococcal Gangrene) Puerperal Fever Bacteremia/Sepsis Diseases Attributable to Local Infection with S pyogenes and Their By-Products: Streptococcal Sore Throat (Pharyngitis) Streptococcal Pyoderma Invasive Group A Streptococcal Infection: Streptococcal Toxic Shock Syndrome Scarlet Fever Post streptococcal Diseases: Rheumatic Fever Glomerulonephritis