What’s Causing a Child’s Sudden High Fever?

A two-year-old child suddenly developed a high fever of 40.3 degrees Celsius three days ago. After blood tests confirmed a bacterial tonsillitis, there was no sign of swelling. After three days of intravenous ceftriaxone and Yanhuning, the fever persisted, and the child recently began experiencing difficulty walking, showing a waddling gait. There were no abnormalities when sitting or lying down and turning over. Could this be due to an accidental sprain in the waist that caused the fever?
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