How should continuous fever be treated?

Patient's question:

Medical History (onset time, main symptoms, follow-up hospital): Continuous one month with persistent fever symptoms, with temperatures ranging below 38 degrees Celsius, headache, sore throat, and thick phlegm in the posterior wall of the pharynx. The phlegm disappeared after taking anti-inflammatory medication, but the throat remained red without pain. Today, the temperature has already risen to 38.2 degrees Celsius.
Previous Treatment and Effectiveness: Taken antiviral medications and Cefixime, Cefaclor. Cefixime helped reduce fever when taken, but fever returned when not taken. Undergone some detailed examinations, including an electroencephalogram, nasal examination, and lung CT, all of which were normal.
Desired Help: Unsure what to do, why the persistent high fever? Taken over 6 or 7 boxes of anti-inflammatory medication. Is it necessary to receive intravenous fluids? If so, what type of medication should be administered?

Doctor's answer:

According to the patient's medical history, it may be diagnosed as: Peritonsillar abscess. After oral antibiotic treatment, the effect was unsatisfactory, and it recurred repeatedly. The abscess in the patient's throat has already formed, and it can be treated with incision and drainage or aspiration of pus in the otolaryngology department.
Medical advice:
1. Peritonsillar abscess generally responds poorly to oral antibiotics.
2. Inpatient intravenous antibiotic treatment.
3. Surgical treatment: aspiration of pus or incision and drainage. Only by completely removing the pus can the symptoms be resolved. Without completely clearing the source of infection, any medication is merely treating the symptoms rather than the root cause.

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