Causes and Treatment Methods for Persistent High Fever in Children

A 7-year-old boy has a persistent fever of 40 degrees. After taking fever-reducing medication, his temperature drops but rises again after a few hours. Other symptoms include lymphadenitis, leukocytosis, dark yellow and slippery tongue coating, pharyngeal abscess, nasal congestion, loose stools, and diarrhea. What could be the possible causes of this recurrent fever, and how should it be treated?
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