what is the most common streptococcal infection
What is impetigo? Impetigo is a common bacterial skin infection caused by Group A Streptococcus (GAS) or strep.. Group A Streptococcus (GAS) or strep is a common bacterium (bacterium is the singular form of the plural, bacteria) that is found on the skin or in the throat (strep throat). People can carry GAS and have no symptoms of illness or they may develop relatively mild skin infections, including impetigo.