No HIV transmission if viral load undetectable

HIV-positive men receiving treatment that makes the virus undetectable can have unprotected sex without the risk of infecting their partner, according to Australian-led research.

The study of serodiscordant homosexual couples showed that no transmission of HIV occurred to a HIV-negative partner if their HIV-positive partner had an undetectable viral load (defined as less than 200 copies per mL).

The observational study of 358 couples — which included 157 couples from Sydney, Melbourne and Brisbane — provided evidence from almost 17,000 acts of anal intercourse without a condom, none of

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