'Second chance': Chimps used in hepatitis B experiments get health checks in Liberia

File phot: A chimpanzee formerly used in research receives a comprehensive health check at a retirement sanctuary for chimpanzees, in Bapakwali, Liberia.Chimpanzees once used in hepatitis B vaccine experiments have undergone comprehensive health checks at a sanctuary in Liberia as part of long-term care aimed at giving the animals a chance to live out their lives in safety.The West African chimpanzees were examined at Humane World for Animals' Second Chance Chimpanzee Refuge in central Liberia, where veterinary teams carried out procedures including dental checks, X-rays, blood tests and nail trimming, sanctuary director Liliana Pacheco Ricote told The Associated Press.More than 400 chimpanzees were used by American researchers in hepatitis B vaccine experiments in Liberia from the 1970s u