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