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Scarlet fever is a disease resulting from a group A streptococcus (group A strep) infection, also known as "Streptococcus pyogenes". The signs and symptoms include a sore throat, fever, headaches, swollen lymph nodes, and a characteristic rash. The rash is red and feels like sandpaper and the tongue may be red and bumpy. It most commonly affects children between five and 15 years of age.