Patients with isolated febrile seizures (FEB3B) usually have onset between ages 5 months to 4 years and show spontaneous remission by age 6 years (summary by Singh et al., 2009), whereas patients with GEFS+ continue to have various types of febrile and afebrile seizures later in life (summary by Singh et al., 1999).
For a general phenotypic description and a discussion of genetic heterogeneity of GEFS+, see 604233.
For a phenotypic description and a discussion of genetic heterogeneity of familial febrile seizures, see 121210. [from
OMIM]