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An 18-month-old boy is brought to the emergency department (ED) by a fire and rescue team because he was turning blue and rhythmically shaking his extremities. The episode lasted for about 2 minutes and stopped without intervention prior to paramedics arriving on the scene. He had no history of head trauma. He has been well, although his twin sister had a fever of 39.4°C (103.0°F) 5 days ago and now has a rash over her entire body. There is no family history of seizures. In the ED he is febrile to 40°C (104°F), with a respiratory rate of 26/min, blood pressure of 80/38 mm Hg, and heart rate of 84/min. He is tired but otherwise well appearing, his mucous membranes are moist, and there is no nuchal rigidity or focal neurologic signs.
How should the physician counsel the parents?
A. The child has a 10% risk of developing epilepsy
B. The child is at no increased risk of having another seizure
C. There is a 15% risk that the child will have a developmental delay
D. There is a 30% chance that the child will have another febrile seizure
E. There is a 75% chance that the child will have another febrile seizure
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