What factors cause a child's fever not to subside?

Patient's question:

At 4 PM on the 15th, after picking up from kindergarten, I suddenly had a fever of 38.7°C. I immediately went to the children's hospital for an IV drip. When I returned home, the fever remained high at 40°C and didn't subside. The fever would temporarily rise a little with antipyretic medication, only to drop right back down. This high fever lasted for two days.
On the third day, in the morning, the doctor tested my urine and said there were no issues. I received IV fluids for three days, which included Yanhuaning and Clindamycin. During the day on the third day, the fever was gone, but at night it reached 39°C, and I started coughing and having clear nasal discharge. The fourth day was similar. Previously, I had been prescribed Erythromycin and pediatric Paracetamol, Yellow Antihistamine Granules, in addition to the ribavirin I bought myself.
By today, I had finished the Erythromycin, and the doctor examined my throat and said there were no problems, prescribing Aurospain and Azithromycin. However, suddenly today, the fever started during the day and is now at 39.5°C, even after taking antipyretic medication. Why is the fever still present today?

Doctor's answer:

According to your description, the child has recurrent fever, and the blood test results are not elevated, which should be related to a viral infection. It is recommended that the child's condition is related to the recent climate. Drink more water, use fever-reducing medication if the temperature is below 38.5 degrees, take oral Lingyan Qutu Granules and Azithromycin, maintain a light diet, and pay attention to rest. It is suggested that you have the child re-examined and allow the doctor to appropriately adjust the medication based on the examination results.

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