This document summarizes meningitis in children, including the definition, causes, signs and symptoms, diagnosis, treatment, and prevention. Meningitis is an inflammation of the membranes surrounding the brain and spinal cord. It most commonly affects infants and children under 5 years old. Bacteria such as pneumococcus, meningococcus, and H. influenzae are common causes. Signs include fever, headache, neck stiffness, and altered mental status. Diagnosis involves lumbar puncture and culture of spinal fluid. Treatment involves antibiotics and supportive care. Vaccines can help prevent certain bacterial types. Complications may include neurological deficits if not treated promptly.