title: Robert Koch and the invention of the carrier state: tropical medicine, veterinary infections and epidemiology around 1900.
authors.affiliation: Section for Medical Anthropology and Medical History, University of Oslo, Frederik Holts hus, Ullevål terrasse, N-0450 Oslo, Norway. christoph.gradmann@medisin.uio.no
authors.forename: Christoph
authors.initials: C
authors.lastname: Gradmann