Streptococcus Pyogenes - Find an introduction, illustrations, and photographs. From Todar's Online Textbook of Bacteriology. NHS Choices: Pneumococcal Infections - Provides information on the invasive and non-invasive infections cased by bacteria known as streptococcus pneumoniae. Includes a short video and details of symptoms, causes, diagnosis, treatment and prevention. Medmicro: Streptococcus - Scientific and medical information about the bacteria and the disease it causes. Streptococcal Toxic-Shock Syndrome - Research article discusses the spectrum of the disease, pathogenesis, and new concepts in treatment. Group A Streptococcal (GAS) Disease - Fact sheet from the Centers for Disease Control. MedlinePlus: Streptococcal Infections - Directory of articles, factsheets, and news.