Streptococcal Home>Conditions_and_Diseases>Infectious_Diseases>Bacterial>Streptococcal   Group B    Rheumatic Fever    Scarlet Fever    Strep Throat              Web Pages Strep A Infections Causes, treatment and prevention of Strep A infections and their sometimes serious consequences. Group A Streptococcal (GAS) Disease Fact sheet from the Centers for Disease Control.