In a sudden spurt in dengue, ten new cases of the disease have been reported by the district health authorities of Dehradun on Saturday. With the addition, the number of dengue cases this season has mounted to 28. The district vector-borne diseases officer Subhash Joshi said that out of ten cases found positive in Enzyme Linked Immunosorbent Assay (ELISA), five are from Dehradun while others are from Tehri and Saharanpur.