The 19th International AIDS Conference in Washington has ended, after a week of events focused on finding ways to end the epidemic.

More than 20,000 delegates, including entertainers, high-level politicians and people who work on the front lines of AIDS research attended the six-day event.

The funding of AIDS research was high on the agenda, at a time when the U.S. and other donor countries, which have spent billions of dollars fighting AIDS, face economic crises at home.

Former U.S. president Bill Clinton addressed the conference's final session Friday. He said he has spoken to health care workers who say there is not enough funding for pregnant women and mothers. The U.S. says it is donating an additional $80 million to help eliminate mother-to-child infections by 2015.

The conference was held in the U.S. for the first time in 22 years, after President Barack Obama lifted restrictions on HIV-positive people entering the country.