A total of 4,098 patients with symptoms similar to dengue fever had been admitted to hospitals throughout the country up till Saturday, a Health Ministry press release said. Dengue fever has killed a total of 37 people in the country including 35 in Sindh and 2 in NWFP, while the total number of patients confirmed positive for the dengue virus is 1,487. In Islamabad and Rawalpindi, 619 patients with dengue fever symptoms have so far been hospitalised. The total number of confirmed dengue patients in the twin cities is 226.