A 35-year-old man with a history of recurrent acute tonsillitis (4 episodes in the past 18 months) presents with fever, sore throat, and dysphagia. On examination, he has bilateral tonsillar enlargement with purulent exudate, cervical lymphadenopathy, and a white cell count of 13,200/μL. Rapid antigen detection test (RADT) for Group A Streptococcus is positive. He is treated with amoxicillin-clavulanate and makes a full recovery within 5 days. Which of the following is the most appropriate next step in management?