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Causes
By Mayo Clinic staffThe cause of strep throat is bacteria known as Streptococcus pyogenes, or group A streptococcus.
Streptococcal bacteria are highly contagious. They can spread through airborne droplets when someone with the infection coughs or sneezes. You can also pick up the bacteria from a doorknob or other surface and transfer them to your nose or mouth. Kitchen utensils and bathroom objects are other common modes of infection transmission.
