I wanted to put in a plug for a book I'm reading called, "This is a Soul: The Mission of Rick Hodes" by Marilyn Berger. The book chronicles the work of Dr. Hodes, an American doctor who has lived in Ethiopia for over three decades assisting children with horribly severe - oftentimes lethal - spinal problems (frequently tuberculosis-related). Dr. Hodes himself has adopted several sick Ethiopian children.
During his emergency medicine training, my husband worked with Dr. Hodes and was tremendously impressed with his dedication. Here is more information about Rick Hodes and the work he does.