AKT-0525
A 6-year-old boy presents with swelling under his arm. He was well until six days before, when he developed mild fever and malaise. Immunisations are up-to-date. No family history of note. The family have a pet kitten and there were visible scratches on his arm.
On examination the temperature is 37.8°C. He has a 2.5 cm smooth enlargement of a node in the right axilla. This is slightly red but not fluctuant. Otherwise there are no abnormalities to find.
What is the single most appropriate treatment?