A 6-year-old girl is brought in with a 5-day history of sore throat and fever. Other children at school have had similar symptoms. She has not had any cough during this time. Her medical and family history is insignificant. Her vitals are currently within normal limits. On physical examination, her anterior cervical nodes are palpable and tender. There are no exudates seen on the posterior pharyngeal wall. What is the next best step in the management of this patient?