Undetectable = Untransmittable

Undetectable = Untransmittable (U=U) is a health-education message used in HIV campaigns. It means that if an HIV-positive person has an undetectable HIV viral load, they cannot sexually transmit HIV to others. U=U is supported by numerous health groups and organisations worldwide, including the World Health Organization. The validity of U=U has been proven through many clinical trials involving thousands of couples. U=U is also an important concept in HIV prevention. This approach to HIV prevention is known as treatment as prevention.