Streptococcal Infections By Larry M Bush, MD, FACP, Charles E Schmidt College of Medicine, Florida Atlantic University; Maria T Vazquez-Pertejo, MD, FACP, Wellington Regional Medical Center Reviewed / Revised May 2023 View Patient Education Classification of Streptococci Virulence Factors Diseases Caused by Streptococci Diagnosis Treatment Key Points More Information Topic Resources Centor Strep Pharyngitis... Streptococcal Pharyngitis Scarlet Fever Strawberry Tongue (Child) Impetigo Erysipelas (Face) Streptococcal Cellulitis Streptococcal Cellulitis... Streptococcal Cellulitis... Group A Streptococci (Necrotizing... Lancefield Classification * Streptococci are gram-positive aerobic organisms that cause many disorders, including pharyngitis, pneumonia, wound and skin infections, sepsis, and endocarditis.