What causes elevated white blood cell count in children?

There are many reasons that can cause elevated white blood cell count in children, generally including bacterial infections, allergies, and blood disorders. 1. Bacterial infection: If a child develops an infectious disease caused by bacterial infection, it may lead to an elevated white blood cell count. 2. Allergy: When a child is exposed to certain allergens, an allergic reaction may occur, resulting in increased white blood cell count. 3. Blood disorders: If a child has a blood disorder such as leukemia, the white blood cell count may become abnormally high.