Hiv in North East India

I am a researcher working on Hiv and Aids in north east India. The north east has been a hot bed for Hiv and Aids. Prime factors have been injection drug use and the porous nature of the border adding fuel to the fire. Can you please give me more insight on this issue and any special mention of geographical , cultural or economic factors that might be playing into this issue will be very helpful. Things that I could use more information about include , any special sexual or cultural practices. Geographical factors as obstacles to getting good quality care etc. Thank you .