The Durbar runs the STD/HIV Intervention Programme (commonly known as the Sonagachi Project) since 1999. The ownership and management of the Sonagachi Project was taken over by DMSC from the All India Institute of Hygiene and Public Health, a central government public health training and research institute based in Kolkata, which had initiated the programme in 1992. After gaining control of the STD/HIV Intervention Programme in 1999, DMSC began replicating the Sonagachi model in other red light areas in West Bengal. DMSC also implements STD/HIV intervention Programme among street-based sex workers and their clients, covering a population of over 20,000 sex workers and migrant labourers. DMSC currently implements and runs STD/HIV intervention programmes in 49 sex work sites in West Bengal.