<prompt> Most efficient route of HIV transmission is:-SexualBloodNeedles syringesVeical  <response>: Routes of transmission of HIV: Sexual - MC Route - 90 new case in India ; least dangerous or least efficient route 0.01-0.1 Blood - Least common Route 5; Most dangerous efficient route 90 chances Needles syringes - 0.1 - 0.03 chance Veical - 30 from mother for child 