The Gates certainly have done their homework, and I believe that this is an understood issue, but they only have so many resources, and want to work on a particular set of goals.
I used to really dislike Bill Gates, Microsoft, and all that he stood for. I heard of his charity, thought "hey that's nice" but that was about it. Then, I saw him on Charlie Rose, and everything changed. He answers a lot of questions about the health care issue of impoverished nations, and shows a great deal of understanding of the problems they're dealing with, and what will happen when they do what they can. http://charlierose.com/watch/60331104
I used to really dislike Bill Gates, Microsoft, and all that he stood for. I heard of his charity, thought "hey that's nice" but that was about it. Then, I saw him on Charlie Rose, and everything changed. He answers a lot of questions about the health care issue of impoverished nations, and shows a great deal of understanding of the problems they're dealing with, and what will happen when they do what they can. http://charlierose.com/watch/60331104