Delegates from more than 100 countries are set to attend a week-long international AIDS conference opening Sunday in Bangkok, Thailand.
The World Health Organization said Saturday there has been significant progress in providing free treatment to AIDS victims in developing countries.
The organization said more AIDS victims in Africa, Asia, South America and Eastern Europe now have greater hope of living longer than they did a year ago.
But AIDS experts say more than 90 percent of HIV carriers worldwide do not know they are infected, and have recommended more routine testing.
Chinese Premier Wen Jiabao Saturday issued a rallying cry to the public to help fight AIDS. More than 800,000 Chinese have been diagnosed with the AIDS virus. U.N. experts say the figure could reach 10 million by 2010.