question: my son was diagnosed with tonsilitis.his pedia gave him clarithromycin 125mg/5ml.his 5 years old and his weight is 24.9kg.after 4 days his fever recurred.on the fourth and fifth day he had a temp of 38 but it was only during the night.on the sixth day he had fever every six hours.his pedia changed his antibiotic into cefuroxime 125 mg/5ml.he told me to have my son undergo a lab test on cbc platelet and typhoid.the result was normal on the cbc platelet and he is negative of typhoid fever.my concern is my son still has a fever of 38 every 8 or 10 hours.what must be the possible cause of his fever?