How often do febrile seizures occur in children who experience a fever?

Febrile seizures occur in a significant percentage of children who experience fever, typically affecting about 10-15% of these cases. This is particularly relevant for children between the ages of 6 months and 5 years, who are most susceptible. The incidence can vary based on several factors, including the overall health of the child and the specific cause of the fever.

The correct choice reflects the typical occurrence rate seen in clinical practice, emphasizing that while febrile seizures are a concern, they are not as common as 50% or more of febrile illnesses, which would imply a much higher frequency than observed. Similarly, regarding the lesser occurrence noted in other options, it is important to recognize that febrile seizures can occur even in children without a prior history of seizures. Thus, recognizing the approximate 10-15% prevalence gives a more accurate picture of how often febrile seizures may manifest in the context of febrile illnesses.