Staying adherent to HIV treatment is not only important for the health of a person with HIV. It is also can unlock the power of HIV meds for prevention. There have been no cases of HIV transmission from a person who has undetectable viral load. The risk of acquiring HIV from someone with undetectable viral load is virtually zero. Thus, adherence to an HIV treatment regimen is one of the most important methods of HIV prevention. This strategy is now known as treatment as prevention (TasP).