RT Journal Article SR Electronic T1 Knowing your HIV/AIDS epidemic and tailoring an effective response: how did India do it? JF Sexually Transmitted Infections JO Sex Transm Infect FD BMJ Publishing Group Ltd SP 240 OP 249 DO 10.1136/sextrans-2011-050382 VO 88 IS 4 A1 Sema K Sgaier A1 Mariam Claeson A1 Charles Gilks A1 Banadakoppa M Ramesh A1 Peter D Ghys A1 Alkesh Wadhwani A1 Aparajita Ramakrishnan A1 Annie Tangri A1 Chandramouli K YR 2012 UL http://sti.bmj.com/content/88/4/240.abstract AB Tremendous global efforts have been made to collect data on the HIV/AIDS epidemic. Yet, significant challenges remain for generating and analysing evidence to allocate resources efficiently and implement an effective AIDS response. India offers important lessons and a model for intelligent and integrated use of data on HIV/AIDS for an evidence-based response. Over the past 15 years, the number of data sources has expanded and the geographical unit of data generation, analysis and use for planning has shifted from the national to the state, district and now subdistrict level. The authors describe and critically analyse the evolution of data sets in India and how they have been utilised to better understand the epidemic, advance policy, and plan and implement an increasingly effective, well-targeted and decentralised national response to HIV and AIDS. The authors argue that India is an example of how ‘know your epidemic, know your response’ message can effectively be implemented at scale and presents important lessons to help other countries design their evidence generation systems.