FN1 and pharyngitis: Several recent studies have provided strong evidence that Fusobacterium necrophorum (Fn) has a causative role in nonstreptococcal tonsillitis, particularly in adolescents and young adults and may occur at rates comparable to group A beta-hemolytic streptococcal (GAS) infection, sometimes exceeding 20% of cases.[1–6] Fn also causes up to 20% of recurrent, persistent sore throats.[7] Most epidemiologic studies looking at Fn prevalence in sore throats come from Europe.