Scarlet fever results from group A strep infection. If your child has a sore throat and rash, their doctor can test for strep.Scarlet fever is a bacterial infection caused by group A Streptococcus or “group A strep.” The classic symptoms of the disease are a sore throat and a certain type of red rash that feels rough, like sandpaper.Although anyone can get scarlet fever, it is most common in children ages 5 through 15 years old.It is usually a mild illness, but people with scarlet fever need antibiotics to prevent rare but serious health problems.Antibiotics also help someone with scarlet feve…