Though not present in Denmark for 125 years, 13 imported cases of cholera were reported from 1990 to 2004; six of the patients were hospitalised in the Epidemiklinikken (Department of Infections Diseases) of Rigshospitalet in Copenhagen. The World Health Organisation reported that worldwide, there were more than 110,000 cases of Cholera in 2003, with a fatality rate of 2%. Cholera causes severe loss of fluid because of watery diarrhoea, which can result in dehydration and shock. The fatality rate without treatment is 50%. Oral vaccinations are available and are recommended to relief workers in affected zones. This article describes the patients hospitalised in the Epidemiklinikken, Rigshospitalet, and summarises the characteristics of cholera infection.