The Health Department has issued a cholera warning to people travelling overseas after a member of a tour group returned from Southeast Asia infected with the disease. The woman, 44, from Tuen Mun, was admitted to the Princess Margaret Hospital on September 6 and is said to be in a stable condition. Health officials have contacted 28 members of the group of 31, who took the tour from August 30 to September 2. Nine of the group had developed diarrhoea. They were also admitted to the Princess Margaret Hospital. The Department of Health reminded people travelling outside Hong Kong to take precautionary measures against cholera and other food-borne diseases. The infected woman's family had shown no symptoms of the disease. They were given health education and their home was disinfected. Of the 20 cholera cases confirmed this year, two were imported.