With dengue cases crossing last year's figure of 1,153 in Delhi, Government on Friday said it would launch a special cleaning drive from 6th September to prevent breeding of mosquitoes even as it assured that the strain prevalent this year was far less lethal. After a meeting with all the civic agencies of the capital as well as the Delhi Government, Union Health Minister Ghulam Nabi Azad told reporters that from Monday a massive, coordinated cleaning operation for two days would be launched which would cover all roads, lanes and bylanes. The operation would be conducted by MCD, NDMC, CPWD and the cantonment board. "Mostly big roads are being cleaned and small lanes, bylanes and houses are kept unattended," Azad said. He said that the ministry has also asked agencies like Metro and CPWD to close work in areas where construction is over and use insecticides at the sites of under-construction projects.