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The germ theory, which emerged in the late nineteenth century, focused the world's attention on the specific agents responsible for diseases, but the social and ecological contexts are equally important, and these are now coming more prominently into play with world population well beyond the limits of the earth's carrying capacity and with climate change in progress. Ecological , rapid changes in land use, penetration of formerly inaccessible habitats, and disturbed migration routes can lead to the appearance or diffusion of a disease. While we may be able to identify the microorganisms involved, we can be helpless in the face of it, and our behavior may still promote its spread. (en) |
