### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
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?

### output:

Thank you for your query. It must be difficult seeing your little go through this tough period. I completely understand. Would you please clarify a few things for me ?1)How is your sons overall condition, other than the fever? Is he eating better, playing, having some amount of normalcy? Or is he cranky, irritable, lethargic?2)Does he have any other symptoms other than fever (cough- Chat Doctor.  They take most of the blow and brunt when an infection occurs. This prevents it from entering out body, thus preventing severe disease in most cases. Tonsillitis in the inflammation of the tonsils caused due to infection by bacteria or viruses. Viral tonsillitis is more common and will resolve itself in normal individuals without treatment (symptomatic treatment may be taken to ease through). This maybe accompanied by a fever, cold, cough running nose, throat ache but may not elicit a systemic (body) response, such as increased Leukocytes(cells that fight infection). These infections find it easier to attack an individual when they are already weak (from a bacterial infection, for instance). Bacterial tonsillitis (Strep. Throat, for instance) is associated with similar symptoms and also with a systemic response. After two days of antibiotic therapy the bacterial infection and its systemic response begin to regress. This is an opportune moment for the virus to kick in. Unfortunately, antibiotics don't work against virus. This may be the scenario with your son. Certain complications of a bacterial tonsillitis - peritonsillar abscess (a collection of pus around the tonsils) can cause persistent fever. I recommend seeing his pediatrician (if you haven't already done so)If there are no complication from the bacterial tonsillitis, and no localizing signs (evidence) of a Urinary tract infection, diarrheal disease, meningitis, a viral infection is most likely. This will settle on its own and the mainstay of treatment is rest, HY