INDEPTH Network tests vaccines in Ghana.

KOKUMA GHANA - SEPTEMBER 19: Children at the rural village of Kokmua run in front of a mud house September 19, 2007 in Ghana, Africa. The village is a part of the DSS ? Demographic Surveillance system conducted the INDEPTH Network, collecting health Data from over 140,000 locals. Candidates for drugs or vaccines against malaria, TB and HIV are increasingly moving into clinical trials, and these trials are best held in regions where the diseases hit hardest. But it is complicated to monitor the testing of potential life-saving products when people have no home addresses, official means of identification, or even consistent spelling of family names. Fred Binka, a Ghanaian physician and epidemiologist who runs the INDEPTH Network, is developing systems that can make clinical trials more efficient across Africa. His organization works with community leaders to establish basic identification systems, such as numbering huts in a village or handing out laminated ID cards with photos. (Photo by Shaul Schwarz/Getty Images)