First of all the CDC DOESN'T say blood viral loads are misleading.
YOU added the misleading part. As usual.
This is exactly what the CDC says:Q12. Can I transmit HIV if I have an undetectable viral load? expanded
Yes, it is possible that you could
still transmit HIV. However, having an undetectable viral load greatly lowers the chance of transmitting the virus
to your sexual partners who are HIV-negative. Having an undetectable viral load is also good for your overall health.
Viral load refers to the amount of HIV in the blood. An undetectable viral load is when the amount of HIV in the blood is so low that it can’t be measured. Antiretroviral therapy (ART) reduces viral load, ideally to an undetectable level, when taken consistently and correctly. If a person’s viral load goes down after starting ART, then the treatment is working. However, people with an undetectable viral load still have HIV in their body, which means there is a chance that they can transmit HIV through sex. An HIV-positive person can still potentially infect a partner even if they have an undetectable viral load, because of the reasons listed below.
still be found in genital fluids (e.g., semen, vaginal fluids). The viral load test only measures virus in blood. Although ART also lowers viral load in genital fluids, HIV can sometimes
be present in genital fluids even when it is undetectable in the blood.
Your viral load may go up between tests. When this happens, you may be more likely to transmit HIV to sexual partners. Your viral load may go up without you knowing it because you may not feel any different.
Sexually transmitted diseases (STDs) increase viral load in genital fluids. This means that an HIV-positive person with an STD may be able to transmit HIV to sexual partners even if the blood viral load is undetectable.Researchers are studying how much you can lower your chances of transmitting HIV when your viral load is undetectable, and we should know more when these studies are complete.
This is an older page, see below for a more recent perspective. ( IN EVERY TEST and STUDY there have been exactly ZERO cases of HIV transmissions when the partner is undetectable <50 copies for 6 + months.)
If you are taking ART, follow your health care provider’s advice. Visit your health care provider regularly and always take your medicine as directed. This will give you the greatest chance of having an undetectable viral load. Taking other actions, like using a condom consistently and correctly, can lower your chances of transmitting HIV even more."
Maybe you forgot this CDC press release Sept 2014
"after diagnosis, helps people with HIV live longer and healthier lives, and it prevents the spread of HIV. Yet, only 1 in 4 of the 1.1 million Americans living with HIV have an undetectable viral load. This means the virus is at a level that provides maximum health benefits and reduces the risk of transmitting the virus to others.
“Today, not only can HIV treatment save lives, it can help stop a national epidemic in its tracks,” said Jonathan Mermin, M.D., M.P.H., director of CDC’s National Center for HIV/AIDS, Viral Hepatitis, STD and TB Prevention. “Our goal is to help everyone with HIV know the tremendous health benefits treatment offers to them and the protection it provides to their partners.”
In addition to the positive impact it can have on a person’s health and well-being, people who start and continue treatment are 96 percent less likely to transmit HIV to others. Treatment for health and prevention is a key element in CDC’s HIV prevention toolkit. "http://www.cdc.gov/nchhstp/newsroom/2014/HIV-Treatment-Works-press-release.html