[Study of 52 cases of diphtheria observed over a period of ten years in the North of France (author's transl)].
Over a period of ten years, 88 cases of diphtheria were diagnosed in the North of France especially in the area of Lille, Roubaix and Tourcoing. 25 p. cent of the patients had been correctly vaccinated within less than five years, and among the latter 25 p. cent died from their diphtheria. The clinical presentation was typical but delay in diagnosis is frequent.