A 22-year-old woman from Bangalore presents with a 5-day history of bilateral throat pain, fever (38.5°C), and dysphagia. On examination, both tonsils are enlarged, erythematous, and covered with a thick yellowish exudate. Anterior cervical lymph nodes are tender and enlarged. Rapid streptococcal antigen test (RSAT) is positive. She has no signs of airway compromise. What is the most appropriate next step in management?