7-year-old child scarlet fever blood check can see whether there is no infectious it

Scarlet fever is infectious as long as it is diagnosed, and no additional blood tests are required. The disease is mainly transmitted through airborne droplets, and a small part can be transmitted through skin wounds. Penicillin is generally the first choice in clinical treatment. For penicillin allergy, erythromycin or cephalosporin can be used instead.