Seek and adhere to medical treatment including anti-retroviral therapy, and monitor your HIV viral load closely with your doctor. With effective treatment, the HIV virus can be suppressed to undetectable levels. This benefits your health and also reduces the risk of HIV transmission.

Under the Infectious Disease Act, unless you have maintained a stable undetectable HIV viral load (see below), you must inform your sexual partner of the risks of getting HIV from you before having sex. This is to allow your partner to choose to take appropriate precautions. 

• You are considered to have maintained a stable undetectable HIV viral load if you satisfy the following criteria:

• You have stable, consecutive undetectable HIV viral load test results (below 200 copies per millilitre of blood), for at least six months;

• Your most recent HIV viral load test shows a result of undetectable (below 200 copies per millilitre of blood), and is dated nine months or less before when you have sex;

• You have adhered to medical treatment for HIV infection up to the time of when you have sex; and

• All the HIV viral load test results mentioned above are from a licenced laboratory in Singapore.

If you satisfy the above criteria, you do not pose a risk of transmission of HIV to your sexual partner. Therefore, you no longer need to inform your sexual partner of the risks of getting HIV from you.