Charlie Sheen's HIV is Undetectable - What Does That Mean?

Charlie Sheen is going to reveal tomorrow that he is HIV positive, but something important to note is that his HIV has been undetectable.

The 50-year-old actor has reportedly known that he is HIV positive for more than two years, according to TMZ. He has been taking meds to keep the virus under control and over time, it has become undetectable.

So, what exactly does that mean? An HIV positive person can undergo antiretroviral therapy (ART) to achieve undetectable levels. Once the person successfully goes through the treatment, he or she can reduce the likelihood of transmitting the virus to another person by 96 percent. The person can stay at this level if they keep up with the ART meds.

Being undetectable does not mean that a person has cured themselves of the virus though. It also does not mean that there is a 100 percent chance of protecting your partner from the virus.

Charlie allegedly feels that he did no wrong by not informing sexual partners of his HIV status because he was undetectable, but doctors believe anyone with HIV should be open with their partners about it. His ex-girlfriend Bree Olson has already denied that she has the virus.

Click through the gallery below for Charlie Sheen photos through the years…