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he Group A β-hemolytic streptococcus (Streptococcus pyogenes, or GAS) is a form of β-hemolytic Streptococcus bacteria. It is a gram positive bacteriaum responsible for a wide range of both invasive and non-invasive infections.[1] The name derives from the greek word 'streptos,' meaning 'twisted chain,' due to the fact that the bacteria resembles a string of small pearls when viewed under the microscope | DEADLY DISEASES AND EPIDEMICS STREPTOCOCCUS GROUP A Tara c. Smith Foreword by David Heymann World Health Organization STREPTOCOCCUS GROUP A Anthrax Campylobacteriosis Cholera Escherichia coli Infections Gonorrhea Hepatitis Herpes HIV AIDS Influenza Lyme Disease Mad Cow Disease Bovine Spongiform Encephalopathy Malaria Meningitis Mononucleosis Plague Polio SARS Smallpox Streptococcus Group A Syphilis Toxic Shock Syndrome Tuberculosis Typhoid Fever West Nile .