FILE - A patient's x-rays are examined at a clinic at Masemouse, Lesotho, in this file photo dated March 17, 2010. Lesotho has the third highest prevalence of TB, where poverty and viol

 

              FILE - A patient
FILE - A patient's x-rays are examined at a clinic at Masemouse, Lesotho, in this file photo dated March 17, 2010. Lesotho has the third highest prevalence of TB, where poverty and violence complicates medical treatment, with some patients walking five hours to reach a clinic for their medication. It is announced Monday Feb. 4, 2013 that the world’s most advanced tuberculosis vaccine failed to protect babies against the airborne infectious disease, according to a new study that tested the shot in South Africa. (AP Photo/Denis Farrell, FILE)