Sometimes we think that we have seen the last of problems from the past. For example, in the developed world we sometimes think that particular diseases and conditions of the human frame are 'dead and buried', never to darken lives again. This is, perhaps, not such a wise approach when we remember the re-emergence of Tuberculosis (TB), for example, as a major public health problem in the early 1990s due to the emergence of resistance to antibiotics and the link between TB and HIV (Porter and McAdam, 1994). This continues to have an impact in many societies today.
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