Huge advances have been made in the diagnosis, treatment and prevention of HIV since it was first discovered in the 1980s and in the UK, the UNAIDS 90-90-90 targets are being met.1 HIV is now a manageable chronic health condition and is treated with antiretroviral medications.2 Treatment has come so far that it can now reduce the level of HIV virus in the body (known as the viral load) to such low levels that blood tests cannot detect it. This is known as undetectable. People living with HIV whose viral load is confirmed as undetectable cannot pass on HIV to their sexual partner.3