Geneva ? Demand for human organ transplants far exceeds supply, fueling a growth in “transplant tourism” to developing nations where organs can be bought, the World Health Organization said Friday.

The kidney is the most-sought organ, with the 66,000 transplanted in 2005 covering just 10 percent of the estimated need, WHO said.

The agency had a meeting of experts from around the world this week to discuss how to reduce organ-buying. WHO encouraged countries to use the organs of the deceased rather than letting wealthier people buy them in developing countries.

Because a person can live with only one kidney, people in poor nations may be lured into selling one of them.