Streptococcal pharyngitis (Strep throat) Streptococcus pyogenes 。Resistant to phagocytosis 。 Streptokinases lyse clots Streptolysins are cytotoxic Diagnosis by indirect agglutination Figure 24.3Streptococcal pharyngitis (Strep throat) Figure 24.3 • Streptococcus pyogenes • Resistant to phagocytosis • Streptokinases lyse clots • Streptolysins are cytotoxic • Diagnosis by indirect agglutination