Atripla, the first effective one-a-day pill to treat HIV, is approved in the U.S.

2009

President Obama removes a travel ban preventing HIV-positive people from entering the U.S. This leads to the announcement that the International AIDS Conference will be held in the U.S. for the first time in more than 20 years.

Washington's health department reports that D.C. has a higher rate of HIV and AIDS prevalence than West Africa, at 3%.

2010

The trial of a microbicide gel, CAPRISA 004, shows that it reduces the risk of a woman becoming infected with HIV during sex by almost 40%.

A third phase of a PrEP trial reveals that drugs used to treat HIV may also be effective in preventing infection. Subjects taking a once-daily antiretroviral pill were 44% less likely to be HIV-positive after male-to-male sex.

2011

The National Institutes of Health publishes the results of a study that says taking antiretroviral drugs at the onset of HIV leads to a dramatic reduction in HIV transmission to an uninfected heterosexual partner.

"These results represent another significant step forward in HIV prevention and reinforce the importance of people everywhere knowing their HIV status and being linked to services for HIV prevention, care and treatment," CDC Director Thomas R. Frieden says.

2012

The 19th International AIDS Conference takes place in Washington, bringing together more than 25,000 doctors, scientists, AIDS activists, politicians, philanthropists, drug company representatives, people living with HIV and heads of state from around the world. One of the main themes is the launch of "Towards an HIV Cure."

UNAIDS announces that new HIV infections have dropped more than 50% in 25 low- and middle-income countries, and the number of people getting antiretroviral treatment has increased 63% in the past two years. More than 34 million people are still living with HIV, according to global estimates.

2013

Researchers announce they have "functionally cured" a Mississippi toddler of HIV. They believe that early intervention -- in this case within 30 hours of birth -- with three antiviral drugs was key to the outcome.