In this review of tetanus in Denmark, it is discussed, why tetanus cases continue to occur especially in elderly people, although it is a preventable disease. The phenomenon is due to a lack of primary or booster vaccination and waning immunity with age, and immediate diagnosis and treatment are crucial to prevent deadly outcome. In Denmark, booster vaccination is recommended every tenth year. Estimation of immunisation status by medical interview is unreliable, and a future solution may be the use of a tetanus quick test and focus on booster vaccination in a primary care setting.