A 4-year-old boy presents with a 2-day history of fever, sore throat, and refusal to eat or drink. On examination, he has a temperature of 38.5°C, inflamed tonsils with exudates, and tender cervical lymphadenopathy. A rapid antigen detection test (RADT) for Group A Streptococcus is negative. According to NICE NG84, what is the most appropriate management strategy?