A total of 12 people died of dengue fever in Malaysia since Jan. 1 until Jan. 25, Xinhua quoted the Health Ministry as saying on Monday. A total of 4,221 cases of dengue fever had been reported. This is almost double the 2,103 cases with 5 deaths during the corresponding period last year. The highest number of cases were in central Selangor state with1,727 cases and 2 deaths followed by Kuala Lumpur with 307 cases. Malaysian government has declared war on Malaysia's enemy No.1, the aedes mosquito, the carrier of the dengue fever.