Modifies a noun

• convulsion: The vast majority of febrile convulsions are not serious.

• neutropenia: Nevertheless, there is evidence that a subgroup of patients with febrile neutropenia might benefit from less aggressive treatments.

• seizure: Most febrile seizures occur during the first day or two of a child's fever.

• illness: In children, a mild febrile illness - less severe than measles.

• reaction: Three patients had haemolytic or febrile reactions which may have been due to red cell incompatibility.

• fit: Febrile fits are relatively common - 1 in 20 children under the age of 5 have had a febrile fit during a high temperature.