Bacteria cause strep throat
However, strep throat is an infection in the throat and tonsils caused by bacteria called group A Streptococcus (group A strep).
You can get the infection from someone who is carrying strep A bacteria or is sick from it. Anyone can get strep throat, but it’s most common in children and teens. If you or your child has a sore throat and fever, don’t share cups or utensils until you get a strep test.