[Epidemiology of Legionnaires' disease in Denmark. A comparative study].

An epidemiological study of Legionnaires' disease in Denmark is presented. A high incidence of apparently sporadic cases of Legionnaires' disease in Denmark was found. The source of infection remains obscure in most cases. No outbreaks have been registered in Denmark, in contrast to most European countries. It is concluded that intensified surveillance, including monitoring of water distribution systems in hospitals, combined with an earlier etiological diagnosis might disclose more nosocomial cases.