The primary bacteria that causes strep throat is Streptococcus pyogenes or group A streptococcus. Streptococcal bacteria are very contagious and can travel using many different methods. Most people come into contact with the bacteria through airborne material that an infected person expelled while coughing or sneezing. It is also possible to pick up the bacteria from doorknobs or other infected surfaces. The bacteria enter the system after the bacteria-contaminated hand touches the eyes, nose, or mouth.
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