Updated at 7.31pm: A 25-year-old year Hong Kong woman has contracted dengue fever following a trip to Indonesia, the Health Department confirmed on Tuesday. A spokesman for the Centre for Health Protection (CHP) said the woman fell ill on April 7 when returning to Hong Kong from Indonesia. She had stayed in the Southeast Asian country since January 28. The woman, who now remained stable condition in Ruttonjee Hospital, had developed symptoms of fever, headache, muscle pains and join pains. Her family members did not show any symptoms of the disease, the spokesman said. The latest case brought the number of dengue fever cases reported in Hong Kong in 2006 to nine. All victims contracted the disease while overseas. The CHP spokesman said people should stay alert to the threat of dengue fever and help reduce mosquito breeding. He urged people to: Put all used cans and bottles into dustbins with covers; Change water for plants at least once a week, leaving no water in the saucers underneath flower pots; Tightly cover all water containers, wells and water storage tanks; and Keep all drains free from blockage. The spokesman also advised travellers to: Wear long-sleeved tops and trousers; Use insect repellent on exposed parts of the body; and Use mosquito screens or nets when rooms are not air-conditioned. Hong Kong?s health authorities are concerned about a growing trend of dengue fever infections in Southeast Asia. In 2005, more than 80,000 cases were recorded in Indonesia and over 32,000 cases were each reported in Thailand, Malaysia and Vietnam.