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U=U: Undetectable = Untransmittable
Core message: A person living with HIV who takes treatment and maintains an undetectable viral load has zero risk of sexually transmitting HIV.
U=U is one of the most important public health messages in HIV care. It reduces stigma and helps people understand why treatment and regular viral-load monitoring matter.
Undetectable does not mean HIV is cured. It means the level of virus in the blood is so low that standard tests cannot detect it. Treatment must be continued as prescribed.