Download a PDF version formatted for print: Group A Streptococcus: Commonly Asked Questions (PDF: 60KB/2 pages) What is Group A Streptococcus (GAS)? Group A streptococci are bacteria commonly found in the throat and on the skin. People may carry GAS in the throat or on the skin and not become ill. How are Group A Streptococci Spread? These bacteria are spread by direct contact with discharges from the nose and throat of infected people or by contact with infected wounds or sores on the skin.