The World Health Organization (WHO) is releasing new scientific and normative guidance on HIV at the 12th International IAS (the International AIDS Society) Conference on HIV Science.

New WHO guidance and an accompanying Lancet systematic review released today describe the role of HIV viral suppression and undetectable levels of virus in both improving individual health and halting onward HIV transmission. The guidance describes key HIV viral load thresholds and the approaches to measure levels of virus against these thresholds; for example, people living with HIV who achieve an undetectable level of virus by consistent use of antiretroviral therapy, do not transmit HIV to their sexual partner(s) and are at low risk of transmitting HIV vertically to their children. The evidence also indicates that there is negligible, or almost zero, risk of transmitting HIV when a person has a HIV viral load measurement of less than or equal to 1000 copies per mL, also commonly referred to as having a suppressed viral load.