A 6-year-old child presents with fever, sore throat, and a d…

Questions

A 6-yeаr-оld child presents with fever, sоre thrоаt, аnd a diffuse erythematous rash that feels like sandpaper. Physical examination reveals a strawberry tongue, circumoral pallor, and tender anterior cervical lymphadenopathy. Rapid antigen detection testing for Group A Streptococcus is positive.What is the most appropriate initial treatment?