organism that causes strep throat
Strep throat is caused by various types of bacteria called Group A streptococcal bacteria. These bacteria cause other common infections also, such as tonsillitis and scarlet fever.ore specifically Group A Streptococcus bacteria. Group A is a designation of a specific type of antigen in the cell wall that this bacterial group pos â¦ sess. The most common culprit to cause strep throat is the bacterium Streptococcus pyogenes.