In a written reply in the Lok Sabha on Tuesday, Union Health and Family Welfare Minister Ghulam Nabi Azad said the total number of people died of dengue in India till July this year is 56 while it was 76 in 2012.
The health minister said there is no single reason for the increase in cases. There could be various man-made and environmental factors, he added.
Azad said: "The unprecedented growth in population, unplanned rapid urbanization and inadequate waste management are reasons behind the outbreak."
Water supply mismanagement, gaps in public health infrastructure, increased mobility of population and poor infrastructure to monitor mosquito breeding are some other reasons cited by the health minister.
Kerala reported maximum 5,801 dengue cases followed by Karnataka (3,775), Tamil Nadu (3,079) while 12 cases have been reported from Delhi till the end of July.
The toll has been highest in Kerala and Maharashtra, both reporting 19 deaths each. In Karnataka, 11 people have died while six have succumbed to the disease in Madhya Pradesh.
Dengue is a communicable disease and its symptoms include high fever for four to five days, usually accompanied by severe headache, pain in the eyes, muscles and joints besides rashes. After the fever goes away, blood platelet count starts dipping. This is the most dangerous phase of the disease.