ART shows “zero” risk of transmission

People with HIV who have an undetectable viral load as a result of antiretroviral treatment (ART) have a practically “zero” chance of transmitting the virus sexually.

Statistical analysis shows that the maximum likely chance of transmission via anal sex from someone on successful HIV treatment was 1% a year for any anal sex and 4% for anal sex with ejaculation where the HIV-negative partner was receptive; but the researchers say the true likelihood is probably much nearer to zero than this.

The European researchers

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