Cases have been reported in all 11 districts of the southern Chinese city and authorities are worried the outbreak could rapidly widen without prompt action. Health authorities in the southern Chinese city of Guangzhou are sounding the alarm over a surge in domestic dengue fever cases, calling for residents to be alert and do their part in curbing the spread of the mosquito-borne disease. Dengue cases jumped 73 per cent last week, compared to 252 cases reported the week before, said the