9 out of 10 new HIV infections are from people not on meds - US

This shows the importance of being tested and getting on meds, and how effective the meds are at drastically reducing the number of new HIV infections. This is from the US so I dunno how accurate it'd be for other countries. Possibly a reflection of the lesser access to health care that exists in the US. Still, the figures are emphatic.

More than 90 percent of new HIV infections in the United States could be averted by diagnosing people living with HIV and ensuring they receive prompt, ongoing care and treatment. This finding was published today in JAMA Internal Medicine by researchers at the Centers for Disease Control and Prevention. 

Using statistical modeling, the authors developed the first U.S. estimates of the number of HIV transmissions from people engaged at five consecutive stages of care (including those who are unaware of their infection, those who are retained in care and those who have their virus under control through treatment). The research also shows that the further people progress in HIV care, the less likely they are to transmit their virus. 

“By quantifying where HIV transmissions occur at each stage of care, we can identify when and for whom prevention and treatment efforts will have the most impact,” said Jonathan Mermin, MD, MPH, director of CDC’s National Center for HIV/AIDS, Viral Hepatitis, STD, and TB Prevention. “We could prevent the vast majority of new infections tomorrow by improving the health of people living with HIV today.” more