The main features of the blood count in patients with scarlet fever are a marked increase in the white blood cell count, accompanied by an increase in neutrophils, which generally account for more than 80% of the total, and the presence of toxic granules in severe cases. The clinical manifestations of scarlet fever are mainly fever, pharyngitis, and rash. Most patients will gradually improve their clinical symptoms after regular anti-infective treatment. The first choice of anti-infective drug is penicillin, if penicillin allergy, can also be used erythromycin or SMZ for treatment. Some patients with severe symptoms of infection poisoning may require appropriate fluid supplementation and symptomatic treatment. It is a contagious disease, also need to pay attention to isolation, generally isolation need a week.