[On some problems of the natural foci theory of infectious diseases].
D000818:Animals; D001717:Birds; D002353:Carrier State; D003141:Communicable Diseases / Q000453:epidemiology*; D009033:Culicidae; D004197:Disease Reservoirs; D005859:Germany, East; D006801:Humans; D014777:Virus Diseases / Q000453:epidemiology*
Zu einigen Problemen der Naturherdlehre der Infektionskrankheiten.