1.Etiology nephritogenic streptococci strains ◆ pyoderma M types47,49,55,2,60,and57 throat infection(pharyngitis) M types 1,2,4,3,25,49,and121.Etiology ➢ nephritogenic streptococci strains ♦ pyoderma M types 47, 49, 55, 2, 60, and 57 ♦ throat infection(pharyngitis) M types 1, 2, 4, 3, 25, 49, and 12