HIV Treatment as Prevention
October 17, 2017
Getting and keeping an undetectable viral load is the best thing people living with HIV can do to stay healthy. Another benefit of reducing the amount of virus in the body is that it helps prevent transmission to others through sex or needle sharing, and from mother to child during pregnancy, birth, and breastfeeding. This is sometimes referred to as "treatment as prevention." There is strong evidence about treatment as prevention for some of the ways HIV can be transmitted, and more research is needed for other ways.
People living with HIV who take HIV medicine as directed and get and keep an undetectable viral load have effectively no risk of transmitting HIV to their HIV-negative sexual partners.
Transmission From Pregnancy, Labor and Delivery
If a woman living with HIV can take HIV medicine as directed throughout pregnancy, labor, and delivery and give HIV medicine to her baby for 4-6 weeks after delivery, the risk of transmitting HIV can be 1% or less.
Transmission From Sharing Needles or Other Injection Drug Use Equipment
We don't know whether getting and keeping an undetectable viral load prevents HIV transmission through sharing needles or other injection drug equipment. While we do not yet know if or how much being undetectable prevents some ways that HIV is transmitted, it is reasonable to assume that being on treatment and getting undetectable provides some risk reduction.
Transmission From Breastfeeding
We don't know if a woman living with HIV who has an undetectable viral load can transmit HIV to her baby through breastfeeding. While we do not yet know if or how much being undetectable prevents some ways that HIV is transmitted, it is reasonable to assume that being on treatment and getting undetectable provides some risk reduction.
* From this point forward, undetectable will refer to either viral suppression or an undetectable viral load.
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[Note from TheBody.com: This article was originally published by the Centers for Disease Control and Prevention on Oct. 17, 2017. We have cross-posted it with their permission.]
This article was provided by U.S. Centers for Disease Control and Prevention. Visit the CDC's website to find out more about their activities, publications and services.
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